WO2013004511A1

WO2013004511A1 - Water-bearing domestic appliance having at least one liquor storage means

Info

Publication number: WO2013004511A1
Application number: PCT/EP2012/061975
Authority: WO
Inventors: Hans-Peter Nannt; Anita WEINMANN
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2011-07-01
Filing date: 2012-06-21
Publication date: 2013-01-10

Abstract

The invention relates to a water-bearing domestic appliance, in particular a dishwasher or a laundry treatment appliance, having a washing compartment (1), which serves to hold washware, and at least one liquor storage means (2), which serves to temporarily store wash liquor and has at least one feed opening (8) for introducing gas bubbles (10) of a treatment gas, characterized in that at least one baffle (13) which increases the residence time of the gas bubbles (10) in the wash liquor is arranged in the liquor storage means (2) above the feed opening (8).

Description

Water-conducting household appliance

with at least one fleet store

The invention relates to a water-conducting household appliance, in particular a

Dishwasher, preferably a household dishwasher, or a laundry care device, e.g. a washing machine, a tumble dryer or a laundry drier, with one for receiving items to be washed, i. Material to be treated (this term also refers herein to the laundry to be cared for in laundry care appliances), i. Treatment tank, and at least one for temporary storage of wash liquor, i. Treatment liquid, serving

Fleet memory, i. The term washing container or treatment container in particular also includes the washing machine commonly used in the term washing drum, which serves to receive laundry items to be cleaned and with a suds container fluid-conducting communicates with or is housed in this. Possibly. the tub itself can be designed as a washing drum. In the case of a washing machine, the term rinsing liquor preferably designates a washing or treatment liquid, in particular liquor liquid, provided in its suds container.

The fleet memory can serve in particular to at least a part of the

Flush liquor or rinse liquor from a program step of the cleaning or treatment program to temporarily save to him then for another

Program step of the same or a subsequent cleaning program to use. Above all, can be stored in the fleet storage in particular the present after the last liquid-carrying partial rinse cycle rinse to use them at a later date - such as only days - for a new cleaning of material to be treated, in the case of a dishwasher for a new dishwashing. In order to prevent germination in the fleet storage, it is provided, for example, in a dishwasher known from EP 170 16 44 B1, to introduce ozone gas into the fleet storage or into the rinsing liquor present therein. The object of the invention is to make a water-conducting household appliance such that the rinsing liquor contained in the liquor store is consumed with low consumption

Treatment gas, e.g. Ozone can be disinfected in a simple, effective and environmentally friendly way.

This object is achieved in a water-conducting household appliance of the type mentioned above, that in the fleet storage above the feed opening at least one of the residence time of the gas bubbles in the wash liquor increasing baffle is arranged. The chicane is principally a barrier to horizontally rising gas bubbles, which prevents them from rising vertically upwards. By doing extended residence time is available for the passage of the gas of the gas bubbles, in particular ozone, in the wash liquor in dissolved form more time available than is the case with an unobstructed floating of the gas bubbles. By appropriate design of the chicane can thus be ensured that the gas bubbles completely dissolve, i. their gas volume is completely in the

Rinse liquor dissolves. By the invention, the quantity of gas supplied to the liquor store can be controlled in particular so that no gaseous excess

Treatment gas remains, on the one hand ineffective and on the other hand would be associated with the risk that treatment gas enters the environment under impairment of the device user. By increasing the residence time of the gas bubbles, in particular ozone gas bubbles, by means of the at least one chicane, in the rinsing liquor liquid of the float storage tank, it is possible in particular to provide a hygienically more satisfactory rinsing liquor liquid than in the case of a fleet storage facility without a chicane.

The liquor storage is in the context of the invention, a reservoir and serves in particular to at least a portion of the Spülflottenflüssigkeit, i.

Treatment liquid, from a program step of the current

Temporarily save treatment program, then the ones in it

cached liquid in particular for another program step of the same or preferably a later treatment program to use partially or completely. Thus, for example, a quantity of service water from the rinse cycle of a treatment program to be carried out (in particular dishwasher program in the case of a dishwasher, or laundry care program in the case of a Wäschepflegegeräts,) in an advantageous manner in the fleet memory temporally

cached and reused for the rinse cycle of a later, re-executable program. Furthermore, e.g. additionally or independently of this, the used process water, in particular an intermediate rinse cycle of the respectively proceeding treatment program, can be reused in a subsequent liquid-conducting rinse cycle of the same treatment program as partial bath quantity or total bath quantity. Under fleet storage is therefore preferably a storage container for temporary storage of a within the scope of the invention

Amount of liquid for at least one liquid-carrying rinse or

Partial rinse of a program to be performed or a subsequent, subsequent treatment program understood. This reservoir is

expediently with the fluid circuit of the device in connection.

If necessary, the fleet storage can also be a storage container, which in particular serves for the intermediate storage of externally supplied water. From such a reservoir, the cached, externally supplied raw water for at least one liquid-carrying Teilspülgang or rinse a

be taken partially or completely. In addition, or independently thereof, this type of storage container may in particular be formed as a water pocket contacting a wall of the washing container, which is suitable for cooling the wall e.g. during the drying cycle of a

to be carried out treatment program and thus to an improved

Condensation drying in the washing compartment of the washing container ensures. He thus acts as a heat exchanger.

In the context of the invention, rinsing liquor liquid or rinsing liquor is understood in particular to mean an amount of liquid, in particular water, which can be either a quantity of fresh water or a quantity of fresh and / or hot water, optionally containing cleaning agents, cleaning aids, rinse aids, additives and / or

Dirt particles from the respective to be cleaned and / or treated items to be washed or treated and / or other admixtures may be added.

The chicane can be designed in many different ways, with an easy-to-implement possibility being a chicane in the form of one of pores interspersed material to use. The pores are expediently of course dimensioned such that the gas bubbles penetrate into them and are retained or slowed down, so that more time is available for the transfer of the treatment gas into the rinsing liquor. It may be advantageous if the size or the diameter of the pores decreases with increasing horizontal distance from the feed opening. The passage of gas into the rinsing liquor reduces the gas bubbles, which then - due to buoyancy - in correspondingly reduced pores or

Move pore areas into and thus at locations in the fleet storage tank, where the concentration of the wash liquor dissolved in the treatment gas is lower, so that due to the then existing greater concentration gradient of the solution process

is accelerated. A chicane of the type in question can be provided in a technically simple and cost-effective manner advantageously by a collection of thread or wire-shaped material, preferably by a knitted fabric, a knitted fabric or a braid such as plastic or steel wires.

In another expedient embodiment variant of a chicane, the latter comprises at least one guide element with a guide surface facing the feed opening, which guides the gas bubbles to a path deviating from the vertical, thereby prolonging the residence time of the gas bubbles in the wash liquor, as compared to vertical floating of the gas bubbles is reached. The guide surface may e.g. Run on a curved path is formed in particular as an example, in a plane plane extending inclined surface. The

In this case, the guide element can be made of a sheet metal strip which can be produced in a simple manner and mounted in the fleet memory with little effort. Made of stainless steel.

The residence time of the gas bubbles in the rinsing liquor or in the fleet storage can be in a simple manner, in particular by a more or less strong inclination of

Adjust the guide element. Preferably, the residence time of the gas bubbles can also be adjusted by the fact that at least one guide element pair of two guide elements succeeding one another in the direction of movement of the gas bubbles is present, wherein the latter

Guide surfaces are inclined in opposite directions. That For example, that one guide element to the left and the other guide increases to the right. The gas bubbles are thus on a total of zigzag or meandering

Guided path of movement, whereby the path of the gas bubbles extended by the rinsing liquor becomes. In this case, the width of the fleet storage can be more or less utilized and thereby depending on the dissolving behavior of the gas used and the desired concentration of dissolved gas in the rinsing liquor, the trajectory of the gas bubbles and thus their residence time in the rinsing liquor can be varied.

In the case of several guide elements following one another in the direction of movement of the gas bubbles, the gas bubbles must be able to pass from the upper end of a guide element to the lower end of a subsequent guide element. This can e.g. be accomplished that the upper ends of the guide elements are provided with at least one opening through which the gas bubbles pass through and can get to the adjoining guide element. Preferably, however, a simpler version in terms of manufacturing technology is used, in which the upper guide element of a guide element pair projects beyond the upper end of the lower guide element in the horizontal direction with its lower end.

To a direct, unhindered floating of the gas bubbles, especially in

Vertical direction, to prevent, is expediently provided in all variants that the chicane in particular about the depth of the

Fleet storage has appropriate width.

Other advantageous developments of the invention are given in the dependent claims.

The invention and its advantageous developments and advantages thereof are explained in more detail with reference to drawings.

Each show:

1 a in a schematic representation of the washing container of a dishwasher with a float tank fixed on the outside thereof,

Fig. 1 b in a schematic representation of a washing machine with an inside

arranged fleet storage, Fig. 2 is a perspective schematic representation of a first advantageous

Embodiment of a fleet storage, according to the invention

3 is a second advantageous embodiment of a inventively constructed fleet storage in a Fig. 2 corresponding representation,

Fig. 4 shows a third advantageous embodiment of a inventively constructed fleet storage in a Fig. 2 corresponding representation, and

5 shows an advantageous modification of the fleet storage of FIG. 4 corresponding to the detail V of FIG. 4.

Elements with the same function and mode of operation are each provided with the same reference numerals in FIGS.

In Fig. 1 a is for reasons of simplification, only the washing container 1 a

Dishwasher shown, wherein outside of the washing tank 1 a fleet storage 2 is fixed. Within the rinse container are baskets 3 for items to be cleaned, i. Material to be treated, as well as a two spray arms 4 comprehensive rinsing system 5 is arranged.

In Fig. 1 b as a further embodiment of a water-conducting household appliance, a washing machine is shown schematically, which is connected to a fresh water network 100 with a valve 101. Via supply lines 102, 104, fresh water passes controllably via an inlet valve 103 into the dispenser bowl 105 of the washing machine. There, laundry treatment agent can be flushed and pass through a further line 106 into the tub 1. In this Figure 1 b of the drawing clarity not shown washing drum is housed, as

Material to be treated to be cleaned to pick up laundry. Possibly. For example, the tub 1 may be in fluid communication with the washing drum in some other way, or may itself be configured as a washing drum. Used fleet is either removed from the machine via the drain 107 and a drain pump 108 (not shown) or passes through a fleet storage line 109 into the float memory 2. From there, the stored in the fleet storage tank 2 either via the same pump 108 or another line system (not shown) are again led into the tub 1, for example via the dispenser or directly into the tub. The liquor storage 2, as shown in FIGS. 2 to 4 can be seen, for example, a cuboid housing 6, the bottom wall 7 is penetrated by a feed opening 8. On the outside, a connection piece 9 connects to the feed opening 8. The feed opening 8 and the connecting piece 9 are used to initiate a

Treatment gas, in particular of ozone, in the fleet storage or in therein rinsing liquor (not shown). The treatment gas, hereinafter referred to as ozone, leaves the feed opening 8 in the form of gas bubbles 10, which rise more or less vertically due to buoyancy forces. On their way through the rinsing water, the ozone dissolves in the rinsing liquor. In order to make the dissolving process of the ozone as complete as possible, is shown in all in Fig. 2 to 5

Embodiments within the fleet storage 2 a baffle 13 is present, this, or at least a part thereof, is arranged above the feed opening 8, so that upwardly rising gas bubbles 10 cooperate with the baffle 13, as will be explained in more detail below. Generally speaking, the baffle 13 extends the residence time of the gas bubbles in the rinsing liquor, so that there is sufficient time for the entire volume of gas trapped in the gas bubble to dissolve in the rinsing liquor and thus to have an antibacterial or disinfecting effect.

In the liquor storage 2 shown in Fig. 2, a baffle 13 in the form of a textile structure 14 is present, which is generally a collection of interconnected threads or wires, for example made of plastic or metal, preferably a Drahtgewirke, knitted wire or the like , In the textile structure more or less large gaps or pores 19 are present due to loops of wire, through which gas bubbles can penetrate into the textile structure 14 and adhere to it. Because the gas bubbles in the textile structure 14 are virtually immobilized, sufficient time is available for the diffusion of the ozone into the rinsing liquor surrounding the respective gas bubble so that ultimately the entire gas bubble can be dissolved. The formation of a gaseous ozone surplus, which would accumulate on the top wall 15 of the fleet storage and could possibly get into the environment, is characterized prevented. 2 may, for example, be pressed in the form of a cuboid 16, which extends at least in an area of the float storage 2 situated above the supply opening 8, but preferably over its entire width. In this case, it may be expedient if not only one, but a plurality of feed openings 8 are provided in the bottom wall 7 of the float storage tank 2. The textile structure 14 has a depth 18 corresponding to the depth of the float storage 2, so that the inner cross section of the float storage 2 is completely covered with the textile structure 14, so that no gas bubbles

can float upwards unhindered. The textile structure 14 may be made so that its pores 19, which are formed approximately by stitches, co-exist with them

reduce the increasing distance from the feed opening 8. In this way, after they have been held for some time at a lower point of the textile structure, gas bubbles can float upwards after reduction of their volume and reach a point within the structure 14 at which the

Rinse liquor still has a lower ozone concentration. Due to the increased concentration gradient, the dissolution process is faster.

In Fig. 3, an embodiment is shown, in which the baffle 13 is formed of a plurality of horizontally stacked wire fabrics 20 made of plastic or metal wire. The wire mesh 20 preferably have a vertical distance from each other. Screen openings or pores 19 are present in the wire fabrics 20. The diameter or the size of these pores is dimensioned such that a gas bubble rising from bottom to top can not pass through the pores 19. Only when a part of the ozone has entered the rinsing liquor, this is possible. It is also conceivable, of course, that due to adhesion forces, a gas bubble will stick to a chicane 13 until it is completely dissolved. In the case of a plurality of wire meshes 20 arranged horizontally one above the other, it may be expedient if the size of the pores 19 or the screen openings in the wire meshes decreases with increasing distance from the feed opening 8, as in the exemplary embodiment described above. The pores 19 'of the upper wire fabric 20 are in the embodiment of Fig. 3 recognizable smaller than the pores 19 ^{' of} the upper wire fabric 20. Gas bubbles passing through the lower wire fabric then remain on the upper wire fabric 20 adhere until they pass through the pores 10 ' can, with its ozone volume has been reduced so that the gas bubbles in their remaining, unhindered way up completely can dissolve. The wire cloths 20 also preferably extend over the entire width of the float storage 2 and also have a width which corresponds to the depth 17 of the fleet storage. In the embodiment shown in FIG. 4, the baffle 13 comprises a plurality of guide elements 23 formed by strips of sheet metal or plastic. The guide elements 23 each have an underside facing the feed opening 8 and forming a guide surface 24. Upwardly rising gas bubbles 10 first reach the respective guide surface and are thereby forced onto a movement path which deviates upward from the direct horizontal path. In this way, the path, in particular ascent, of the gas bubbles 10 is increased by the liquor storage 2 and the rinsing liquor contained therein, resulting in a prolonged residence time of the gas bubbles results. The guide surfaces 24 are preferably rectilinear

Formed inclined surfaces, wherein two in the direction of movement 25 of the gas bubbles 10 successive guide elements 23 form a guide element pair 23a / 23b, 23b / 23c, 23c / 23d, the guide surfaces 24 are inclined in opposite directions. In order to enable the passage of the gas bubbles from a guide element to the one above it, in the exemplary embodiment, the upper guide element 23 of a guide element pair projects beyond the upper end 27 of the respective lower guide element 23 in the horizontal direction with its lower end 26.

Between said upper and lower ends 26, 27 is a respective

Horizontal distance available, so that the gas bubbles can pass without hindrance from one guide element to another. The guide elements 23 also have a depth 17 of the float storage 2 corresponding width and extend in

Substantially, in the case of the embodiment of Fig. 4, the feed opening 8 is arranged near the lower end 27 of the lowermost guide element 23a. As the distance from the feed opening 8 increases, the size of the gas bubbles decreases due to the dissolution of ozone, whereby the bubbles finally ultimately dissolve completely along the guide surfaces 24 in the course of their trajectory.

In Fig. 5, a variant is shown, in which the guide elements 23 'do not have different lengths, thus do not overlap at their ends. The guide elements 23 ' In this case, the gas bubbles moving upwards in the direction of movement 25 on the guide surface 24 can reach the respective next guide element 23, at least one opening 30 in the upper end 27 'of the guide elements 23' present, through which the gas bubbles can pass.

_{Λ AΛ A}

1 1

LIST OF REFERENCE NUMBERS

1 washing container

2 fleet storage

3 reception basket

4 spray arm

5 spray system

6 housing

7 bottom wall

8 feed opening

9 connecting pieces

10 gas bubble

13 chicane

14 textile structures

15 top wall

16 cuboid

17 depth

18 width

19 pore

20 wire mesh

23 guide element

24 guide surface

25 direction of movement

26 lower end

27 upper end

28 supernatant

29 side wall

30 breakthrough

100 fresh water network

101 valve

102 supply line

103 inlet valve supply line

Einspülschale pipe

procedure

Drain pump Fleet storage line

Claims

1. Water-conducting household appliance, in particular dishwasher or

Laundry care appliance, having a rinse container (1) serving for receiving items to be washed and at least one liquor storage (2) serving for temporary storage of rinsing liquor with at least one feed opening (8) for introducing gas bubbles (10) of a treatment gas, characterized in that the liquor store ( 2) above the feed opening (8) at least one of the residence time of the gas bubbles (10) in the wash liquor increasing baffle (13) is arranged.

2. Water-conducting household appliance according to claim 1, characterized in that the baffle (13) consists at least partially of a pores (19) interspersed material.

3. Water-conducting household appliance according to claim 2, characterized in that the size or the diameter of the pores (19) with increasing distance from the

Supply opening (8) decreases.

4. Water-conducting household appliance according to claim 2 or 3, characterized in that the chicane (13) at least partially consists of a textile structure.

5. Water-conducting household appliance according to claim 4, characterized in that the baffle (13) is a knitted fabric, a braid, or a knitted fabric.

6. Water-conducting household appliance according to one of the preceding claims, characterized in that the baffle (13) has at least one guide element (23) with one of the feed opening (8) facing guide surface (24) which the gas bubbles (10) on one of the vertical deviating movement path leads.

7. Water-conducting household appliance according to claim 6, characterized in that the guide surface (24) is an inclined surface

8. Water-conducting household appliance according to claim 7, characterized by at least one pair of guide elements (23a / 23b, 23b / 23c, 23c / 23d) of two in the direction of movement (25) of the gas bubbles (10) successive guide elements (23) whose guide surfaces (24) in opposite directions are inclined.

9. Water-conducting household appliance according to claim 8, characterized in that the upper guide element (23) of a Leitelementpaares with its lower end (26) projects beyond the upper end (27) of the lower guide element (23) in the horizontal direction.

10. Water-conducting household appliance according to one of claims 6 to 9, characterized in that the guide element (23) is formed by a metal strip.

1 1. Water-conducting household appliance according to one of the preceding claims, characterized in that the baffle (13) has a depth (17) of the fleet storage (2) corresponding width.