EP2440106A1

EP2440106A1 - Household appliance having an ozone generator and an ozone eliminating device, and related method

Info

Publication number: EP2440106A1
Application number: EP10720177A
Authority: EP
Inventors: Hans Eglmeier; Hartmut Schaub
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2009-06-08
Filing date: 2010-06-01
Publication date: 2012-04-18
Anticipated expiration: 2030-06-01
Also published as: PL2440106T3; US8394349B2; CN102458208A; EA201171472A1; US20120070352A1; EP2440106B1; DE102009026827A1; CN102458208B; EA018352B1; WO2010142566A1

Abstract

The invention relates to a household appliance, having a container (1) for receiving objects to be treated, and an ozone generator (20), and an ozone eliminating device (18), wherein the ozone eliminating device (18) is arranged in an exhaust air conduit (17), said exhaust air conduit (17) being connected to the container (1). The exhaust air conduit (17) comprises also a fan (19) for removing exhaust air from the container (1). The invention further relates to a method for eliminating ozone from said household appliance, wherein a negative pressure is generated, particularly in the container (1).

Description

Domestic appliance with an ozone generator and a

Ozone removal device, and associated method

The invention relates to a domestic appliance with a container for receiving objects to be treated and an ozone generator and an ozone removing device, wherein the ozone eliminating device is arranged in an exhaust duct, which exhaust duct is connected to the container. The invention also relates to a method for removing ozone in such a domestic appliance.

A domestic appliance and a method of the type mentioned above are apparent from the document DE 32 32 057 A1.

The use of ozone in a domestic appliance, especially in a washing machine or other laundry care appliance, has recently become more attractive. Ozone is not just a powerful disinfectant; In combination with a care or cleaning agent applied in a domestic appliance, it also causes complex and rapid reactions which can lead to an improved care or cleaning effect.

Ozone can be produced in a domestic appliance in different ways, for example by means of a UV lamp generator by irradiation of oxygen with UV radiation below 200 nm, or by a corona discharge, in which oxygen of an electric discharge in the form of a corona is suspended. The corona is created by applying a high voltage of generally at least 5000V to a suitable array of electrodes.

Although ozone in a wash liquor, especially at high temperature, consumed very quickly. However, since ozone is a particularly unpleasant-smelling irritant and can be corrosive, the escape of small amounts from a domestic appliance must be prevented regardless of the presence of intended means and conditions in the household appliance, which can promote elimination of unwanted ozone. WO 2007/143785 A1 describes a system and apparatus for introducing ozone into a washing machine. The system includes a first conduit for introducing ozone from an ozone supply into a scrubbing liquid inlet and a second conduit for discharging ozone into an area above a scrubbing chamber. For introducing ozone and for mixing with a washing liquid, a Venturi nozzle is used. The Venturi nozzle is operatively coupled to wash liquid inlet means to draw the ozone into the wash liquid while the wash liquid is being added to the wash tank.

In WO 2008/1 19631 A1 a washing machine is described in which in a detergent dispenser, i. a Einspülschale, existing microorganisms are eliminated by direct introduction of ozone from an ozone generator in the Einspülschale. In one embodiment, water is added simultaneously to the ozone in the dispenser tray so that the ozone / water mixture is passed through the dispenser tray. This is intended to minimize the possibility of escape of ozone from the washing machine.

US 2008/0302139 A1 discloses a tunnel washer comprising a plurality of zones for washing laundry in a continuous manner, two locations for injecting ozone, a water circuit connecting a water inlet and a water outlet, the water circuit comprising a water reservoir and a venturi injector for dissolving ozone in water, and includes an ozone generator. A negative pressure or vacuum may be applied to the tunnel washer via an ozone eliminator to prevent leakage of ozone. For the generation of the negative pressure, a blower can be used. Excess or leaking ozone can be catalytically converted back to normal oxygen in the ozone removing device.

US 2006/0096038 A1 describes a system for monitoring ozone and controlling the supply of a washing machine with ozone. An ozone sensor indicates the exceeding of a set ozone limit, whereupon an ozone generator is switched off until the ozone concentration is below this limit again. An elimination of ozone is not provided.

DE 32 32 057 A1 describes a cleaning machine for laundry, crockery or the like with a reservoir for a cleaning agent and an ozone generator, at the output of which an ozonization of the cleaning agent in this opening ozone supply line is connected. In one embodiment, the reservoir is associated with a vent line and a heating coil means for eliminating ozone. Fig. 1 shows a washing machine, in which an ozone generator has a compressor, so that the ozone can flow with the required pressure in the reservoir. An overflow serves as a vent line, through which the air produced at low pressure above the detergent level can escape. In this case, the overflow may be provided with a heating device which is heated to such a high temperature that any remaining ozone in the air is destroyed before the air enters the environment. Instead, an activated carbon filter may also be present.

DE 24 33 909 A1 describes a device for the care of garments with a closable with a door cabinet-shaped housing with a receiving space for garments to which the suction and Ausblasseite a circulating air fan are connected with the interposition of an air heater, wherein the receiving space via a fresh air filter the outside space communicates and the suction side of an exhaust fan is connected to the receiving space while its exhaust ends in an opening of an outer wall of the housing. At least one ozonizer is provided for the air of the receiving space. In one embodiment of this device, the outlet of the exhaust fan is connected to the outside space, wherein disposed in the exhaust path an exhaust filter whose filter material consists of activated carbon

EP 0 699 470 A1 describes a process for ozone elimination from gases or liquids in which the gas to be treated or the liquid to be treated is treated by a physical method to remove ozone and then brought into contact with an ozone-binding polymer. In the physical method, in particular, a catalyst, thermal energy and / or radiant energy used. The ozone-binding polymer is in particular polyarylene thioether, polyarylene ether or a macroporous copolymer.

Against this background, the object of the invention is to provide a domestic appliance with an ozone generator, in which ozone discharge can be effectively prevented. Preferably, excess ozone is to be eliminated from possible escape from the domestic appliance. The invention also relates to a method for operating this household appliance.

The object underlying the invention is achieved by a domestic appliance and a method according to respective independent claim. Preferred embodiments of the invention are listed in the respective dependent claims. Preferred embodiments of the domestic appliance according to the invention correspond to preferred embodiments of the method according to the invention, even if it is not separately pointed out here.

The invention thus teaches a domestic appliance with a container for receiving objects to be treated and an ozone generator and an ozone removing device, wherein the ozone eliminating device is arranged in an exhaust duct, which exhaust duct is connected to the container. In this case, the exhaust duct additionally a fan for the discharge of exhaust air from the container.

According to the invention, it is thus provided that ozone is eliminated by a system which removes ozone-displaced exhaust air sucking from the container and, accordingly, from lines and the like communicating therewith.

The objects to be treated may be, for example, objects to be cleaned. The household appliance makes it possible to set the domestic appliance and in particular the container for receiving objects to be treated under a slight negative pressure, so that fresh air is sucked in from any existing openings in the container. The ozone removing device is preferably arranged between the container and the fan. The objects to be treated are not restricted according to the invention. The objects to be cleaned may be, in particular, dishes or laundry. Cleaning also means refreshing according to the invention.

In the ozone removing apparatus, in particular, ozone is eliminated by being absorbed or decomposed on a suitable material. The decomposition can occur, for example, in that the ozone is chemically reacted with a suitable material or catalytically decomposed, for example with formation of oxygen.

In a preferred embodiment of the household appliance according to the invention, the ozone removal device comprises a filter unit, wherein the filter unit preferably comprises a carbon-containing material or another readily oxidizable material. Here again, it is preferable that the carbon-containing material is at least one substance selected from the group consisting of activated carbon, polyarylene thioethers, polyarylene ethers and macroporous copolymers. Suitable polyarylene thioethers, polyarylene ethers and macroporous copolymers are described, for example, in EP 0 699 470 A1.

Activated carbon is particularly preferably used as the carbon-containing material. Activated carbon is generally decomposed by ozone to form carbon dioxide, so that the amount of activated carbon in a filter unit gradually decreases. In a preferred embodiment, the domestic appliance therefore has a sight glass arranged on the ozone removing device. A user of the household appliance can thus detect even without the presence of an ozone sensor, if the filter unit is still working properly, for example, by still enough activated carbon is present.

A preferably used in a domestic appliance according to the invention ozone generator generates about 20 mg / h to 30 mg / h of ozone. For this purpose, in general, the use of a filter unit, which is loaded with about 10 g of activated carbon, sufficient for the entire operating life of the household appliance, from. The exhaust duct can lead into an installation room of the domestic appliance, since the exhaust air contains only small amounts of carbon dioxide and no other interfering components.

An advantage of the domestic appliance according to the invention is that an ozone sensor is not necessary. However, the domestic appliance according to the invention can advantageously have an ozone sensor for measuring an ozone content.

The ozone removing device in the domestic appliance according to the invention comprises, alternatively or in addition to a filter unit, a catalyst for the decomposition of ozone, for example a catalyst for the conversion of ozone into oxygen.

The domestic appliance allows the automatic removal of ozone within the household appliance. A special information about this for a user of the household appliance is not necessary.

However, the home appliance may also include an ozone clearing indicator. The display device may be an optical and / or acoustic display device. Preferably, the domestic appliance then has a display device for non-functioning ozone elimination. For example, non-functioning ozone removal occurs when an existing ozone sensor exceeds one of a predetermined threshold, e.g. 1 ppm, lying ozone concentration. If no ozone sensor is present in the domestic appliance, then a malfunctioning ozone removal may be present if the fan or the ozone removing device is not working properly. The latter can be the case, for example, when a carbon-containing material in a filter unit is used up or a catalyst for the catalytic decomposition of the ozone is poisoned.

In the household appliance according to the invention, a control device is generally present, which can take countermeasures in addition to the control of a cleaning program even in the case of non-functioning ozone removal. Thus, the controller can turn off the ozone generator and / or cause a corresponding acoustic and / or visual indication on the display device in a non-functioning ozone removal. In a preferred embodiment of the invention, the exhaust air duct is connected to a supply air duct of the ozone generator in the domestic appliance. This eliminates any necessary for the operation of the ozone generator blower in a supply air duct of the ozone generator. In a particularly preferred embodiment, the exhaust air duct is connected via a pitot tube to the supply air duct. As a result, an air flow required for the ozone generator is generated particularly efficiently.

The blower present in the domestic appliance according to the invention is generally used in such a way that a flow through the ozone removing device which adjusts itself in the exhaust duct is sufficiently large to prevent the escape of ozone-containing air through other openings of the domestic appliance. In particular, the blower will generally put the domestic appliance, especially the container for receiving objects to be cleaned, under a slight negative pressure, so that fresh air is sucked out of any possibly existing openings of the domestic appliance. The self-adjusting flow rates are preferably greater than the diffusion rate of the ozone molecules.

The domestic appliance according to the invention is particularly preferably a washing machine, a washer-dryer, a dryer or a dishwasher.

A washing machine generally has a tub and a drum rotatably mounted in the tub for receiving laundry to be cleaned. In addition, a washing machine generally also has a lye drainage system arranged at the bottom of the lye container with a drain pump and generally also laundry hoppers and / or scooping devices.

In a preferred embodiment of the invention, in which the domestic appliance is a washing machine, a pressure sensor and / or a temperature sensor are arranged in the tub. Pressure and temperature sensor, if present, are preferably arranged in a lower region of the tub, so that pressure and / or temperature of an aqueous liquid present in the tub can be measured. In the household appliance, the ozone can be used as gas or in aqueous solution.

The invention also provides a method for removing ozone in a domestic appliance. A method for removing ozone in a domestic appliance with a container for receiving objects to be treated and an ozone generator and an ozone removing device, wherein the ozone eliminating device is arranged in an exhaust duct, which exhaust duct is connected to the container. In this case, air is sucked out of the container into the exhaust air duct and conveyed through the ozone removing device using a blower arranged in the exhaust duct.

The objects to be treated may be, for example, objects to be cleaned.

In the method according to the invention, in particular the household appliance, especially the container with the objects to be treated, placed under a slight negative pressure, so that fresh air is preferably sucked from all possibly existing openings of the household appliance.

The source for the ozone to be removed in the domestic appliance can be arbitrary. For example, ozone in the form of a gas or an aqueous solution can be used in the household appliance.

Advantageously, the fan is still operated for a predetermined period even when the ozone generator is already turned off.

In the method according to the invention, the air from the exhaust air duct is preferably at least partially directed into a supply air duct for the ozone generator.

In a preferred embodiment of this method, it is indicated on a display if the removal of ozone as described above does not work properly.

The invention has the advantage that in a simple and very efficient way, escape of ozone from a domestic appliance with an ozone generator can be prevented. This is especially possible if the home appliance is not hermetic the air is locked in a storage room. Excess ozone is not only prevented from escaping but destroyed by an ozone removing device immediately.

Embodiments of the invention are illustrated below with reference to Figures 1 and 2, wherein a washing machine is given as an example of household appliances according to the invention.

Fig. 1 is a schematic representation of the parts relevant to the present explanation of an embodiment of a domestic appliance, in the present case a washing machine, in which a method to be explained below can be carried out. Other embodiments are conceivable. The washing machine shown in Fig. 1 comprises a tub 1, in which a drum 2 rotatably mounted and can be operated by a drive motor 14. The arrow indicates the direction of rotation of the drum. 3 means the axis of rotation of the drum. 2

By this arrangement, in conjunction with specially shaped Wäschemitnehmern 4 and 5 Schöpfeinrichtungen for the wash liquor 6 on the inner surface of the drum shell also also an intensification of the flooding of the laundry items 7 with wash liquor and a reduction of the free liquor achieved, ie the amount of wash liquor in the tub which can no longer be absorbed by the wash saturated with wash liquor.

The washing machine of the embodiment shown here of a domestic appliance also has a liquor inlet system comprising a water connection fitting for the domestic water network 8, an electrically controllable valve 9 and a supply line 10 to the tub 1, which is guided via a Waschmitteleinspüleinrichtung ("Einspülschale") 1 1 from which the feed water can transport detergent portions into the suds container 1. In the feed line 10 there is a venturi nozzle 16, which is connected to an ozone generator 20 via an ozone supply line 25. The water flowing in the supply line 10 sucks from the domestic water network 8 via the venturi nozzle 16 Ozone-containing air is present in the ozone supply line 25. As a result, ozone enters the tub 1 together with water or wash liquor. However, ozone can also be introduced into the receptacle for treatment as gas Items existing container are introduced. In the tub wall 21 there is an inlet 26 in the exhaust duct 17, in which an ozone removing device 18, an ozone sensor 31 and a fan 19 are located. The exhaust duct 17 leads to an exhaust air outlet 23, which protrudes here into a storage room of the washing machine.

In the ozone removing device 18 is a filter unit 28, which contains activated carbon as a carbon-containing material in the presently described embodiment. At the ozone removal device 18, a sight glass 27 is arranged, through which a user of the washing machine can recognize whether in the filter unit 28 still carbon-containing material is present.

For acoustic and / or visual indication of an improperly functioning removal of ozone, a display device 29 is located on the washing machine of the specific embodiment shown here.

Between the blower 19 and the exhaust air outlet 23, in the particular embodiment shown here, a supply air duct 30 for the ozone generator 20 branches off at a pitot tube 24. As a result, the fan 19 can be used simultaneously for operating the ozone generator 20 as well as for operating the ozone removing device 18. The fan 19 has a sufficient power for generating a negative pressure.

In addition, there is a heater 13 in the tub 1 embodiments without heating, however, are conceivable. The valve 9 as well as the heater 13 may be controlled by a controller 12 in accordance with a schedule associated with a timed program and / or the achievement of certain measurements of parameters such as liquor level, liquor temperature, drum speed, etc. within the washing machine can be.

In Fig. 1 15 means a pressure sensor for the measurement of the hydrostatic pressure p in the tub 1. The hydrostatic pressure p results from the level H of forming in the tub 1 free fleet. The signals from the drive motor 14, pressure sensor 15, ozone generator 20, fan 19, ozone sensor 31, etc. are the Control device 12 is supplied, even if this is not shown for reasons of clarity.

FIG. 2 shows a more schematic view, in comparison to FIG. 1, of the presently relevant parts of a washing machine as an embodiment for a domestic appliance. In the embodiment shown here, it is particularly clear how with a single blower 19 both an ozone generator 20 and an ozone removing device 18 can be operated. The fan 19 has a sufficient power for generating a negative pressure.

In FIG. 2, air is supplied to the ozone generator 20 via a supply air duct 30 which at least partially originates from an exhaust air duct 17, in which the ozone removal device 18 is arranged together with a fan 19 and an ozone sensor 31. A pitot tube 24 contributes to a suitable pressure in the supply air duct 30.

The ozone generated in the ozone generator 20 is sucked in from the domestic water network 8 via an ozone supply line 25, which is connected to a Venturi nozzle 16, due to the water flowing in a supply line 10 through the Venturi nozzle 16. Together with the water, the ozone enters the dispenser shell 11 and the tub 1. Other embodiments in which gaseous ozone is used are conceivable. From the tub 1 an exhaust duct 17 goes off, in which by means of a fan 19, if necessary, ozone-containing air is sucked from the tub into the ozone removal device 18.

The exhaust air from the exhaust duct 17 is, as far as it is not passed into the supply air duct 30, fed via an exhaust outlet 23 to the installation room of the washing machine. LIST OF REFERENCE NUMBERS

1 container for receiving objects to be treated, e.g.

tub

2 drum

3 rotation axis

4 laundry hamper

5 scooping device

6 wash liquor

7 pieces of laundry

8 domestic water network

9 electrically controllable valve

10 Supply line to the tub

11 detergent dispenser

12 control device

13 heating

14 drive motor

15 pressure sensor

16 Venturi nozzle

17 exhaust duct

18 ozone removal device

19 blowers

20 ozone generator

21 tub wall

22 pump

23 exhaust air outlet

24 pitot tube

25 ozone supply line

26 entrance to the exhaust duct

27 sight glass

28 filter unit

29 display device

30 Supply air duct for the ozone generator

31 ozone sensor

Claims

1. domestic appliance with a container (1) for receiving objects to be treated and an ozone generator (20) and a

Ozone removal device (18), wherein the ozone removal device (18) in an exhaust duct (17) is arranged, which exhaust duct (17) is connected to the container (1), characterized in that the exhaust duct (17) additionally a fan (19) for Removal of exhaust air from the container (1).

2. Domestic appliance according to claim 1, characterized in that the

Ozone removal device (18) has a catalyst for the decomposition of ozone.

3. Domestic appliance according to one of claims 1 and 2, characterized in that the ozone removal device (18) comprises a filter unit (28).

4. Household appliance according to claim 3, characterized in that the filter unit (28) comprises a carbon-containing material or another easily oxidizable material.

Domestic appliance according to claim 4, characterized in that the carbon-containing material is at least one substance selected from the group consisting of activated charcoal, polyarylene thioethers, polyarylene ethers and macroporous copolymers.

6. Domestic appliance according to claim 5, characterized in that activated carbon is used as carbon-containing material.

7. Domestic appliance according to one of the preceding claims, characterized in that the domestic appliance has a sight glass (27) arranged on the ozone removing device (18).

8. Domestic appliance according to one of the preceding claims, characterized in that it comprises an ozone sensor (31) for measuring an ozone content.

9. domestic appliance according to one of the preceding claims, characterized in that it comprises a display device (29) for a non-functioning ozone elimination.

10. Domestic appliance according to one of the preceding claims, characterized in that the exhaust air duct (29) with a supply air duct (30) of the ozone generator (20) is connected.

11. Domestic appliance according to claim 10, characterized in that the exhaust air duct (29) via a pitot tube (24) with the supply air duct (30) is connected.

12. Domestic appliance according to one of the preceding claims, characterized in that there is a washing machine, a washer-dryer, a dryer or a

Dishwasher is.

13. Domestic appliance according to one of the preceding claims, characterized in that the ozone removing device (18) between the container (1) and the fan (19) is arranged.

14. A method for removing ozone in a domestic appliance with a container (1) for receiving objects to be treated and an ozone generator (20) and an ozone removal device (18), wherein the ozone removal device (18) is arranged in an exhaust duct (17), which exhaust air duct (17) is connected to the container (1), characterized in that air is sucked out of the container (1) into the exhaust air duct (17) using a fan (19) arranged in the exhaust duct (17) and through the ozone removing device (18).

15. The method according to claim 14, characterized in that the container (1) is placed under a slight negative pressure.

16. The method according to any one of claims 14 and 15, characterized in that the air from the exhaust duct (17) is at least partially directed into a supply air duct (30) for the ozone generator (20).

17. The method according to any one of claims 14 to 16, characterized in that on a display device (29) is displayed when the elimination of ozone does not work properly.