DE102011083297B3 - Water-conducting household appliance with a metering pump - Google Patents

Abstract

A water-carrying household appliance (1), which is used in particular as a laundry treatment device for washing and / or drying laundry, comprises a first storage container (2), which is used to hold a first flowable treatment agent (3), and a second storage container (4), which for receiving a second flowable treatment agent (5). In addition, a metering pump (6) with changeable pump direction (7, 8) is provided. The first reservoir (2) is connected to a first connection (9) of the metering pump (6) via a first directional valve (11). The second storage container (4) is connected to a second connection (10) of the metering pump (6) via a second directional valve (12). The metering pump (6) conveys the first treatment agent (3) in a first pumping direction (7) from the first reservoir (2) via the first directional valve (11) to the second connection (10) of the metering pump (6). Furthermore, the metering pump (6) conveys the second treatment agent (5) from the second reservoir (4) via the second directional valve (12) to the first connection (9) of the metering pump (6) in a second pumping direction (8). With this configuration, the two treatment agents (3, 5) can be metered with only one metering pump (6). This reduces the manufacturing costs.

Description

The invention relates to a water-conducting household appliance, in particular a laundry treatment appliance for washing and / or drying laundry according to the preamble of claim 1. Specifically, the invention relates to the field of washing machines and washer-dryers.

From the DE 10 2007 032 759 A1 a laundry treating machine is known in which a laundry treatment room is arranged within a housing, can be filled in the laundry for the purpose of their treatment. Within the housing reservoir for different liquid or gelatinous laundry treatment means are arranged, the contents of which can be given via outlet lines and metering in a common dosing. At the highest point of the dosing a purge line is coupled, which can be controlled by a detergent control fed from a detergent source. The metering devices and the flushing agent control are supplied with signal technology by a control device, so that each of these devices conveys the respective assigned medium at times determined by the control device. The rinsing agent source may be a storage or intermediate storage container for a certain amount of rinsing agent, preferably water, or a connection device to a fresh water network. In the known laundry treatment machine should be avoided that residues of dilute laundry treatment agents nucleate and that different proportions in the rinsing solutions can react with each other and their reaction results severely disturb the further process in a laundry treatment machine. Therefore, in the known laundry treating machine, the dosing line is rinsed immediately before delivering a dose.

The from the DE 10 2007 032 759 A1 known laundry treating machine has the disadvantage that for each reservoir, which receives a laundry treatment agent, an outlet and a metering device are required to promote the laundry treatment agent in the common dosing. In addition, each metering device must be supplied with signal technology separately by the control device, so that a correspondingly large number of outputs of the control device is occupied. The design of the known laundry treatment machine is therefore complicated.

The object of the invention is to provide a water-conducting household appliance, which has an improved structure. Specifically, it is an object of the invention to provide a water-conducting household appliance, in which the number of required components for a dosage and the control effort required for this purpose are optimized.

The object is achieved by a water-conducting domestic appliance, in particular a laundry treatment appliance for washing and / or drying laundry, wherein a first reservoir, which serves to receive a first flowable treatment agent, and a second reservoir, which serves to receive a second flowable treatment agent, are provided, wherein a metering pump is provided with changeable pumping direction, wherein the first reservoir is connected via a first directional valve to a first port of the metering pump, wherein the second reservoir is connected via a second directional valve to a second port of the metering pump, wherein the metering pump in a first pumping direction, the first treatment agent from the first reservoir via the first directional valve to the second port of the metering pump promotes and wherein the metering pump in a second pumping direction, the second treatment agent from the second Vor advances via the second directional valve to the first port of the metering pump.

The measures listed in the dependent claims advantageous refinements of the inventive water-conducting household appliance are possible.

The water-bearing household appliance is particularly suitable for the automatic dosing of two or more treatment agents. The stockpiled in the reservoirs treatment agent can each be stored here in an amount that is sufficient for several program runs, especially washing programs. Depending on the selected treatment program, the required quantities of the treatment agents required in each case can then be automatically metered automatically. The embodiment according to the invention makes it possible to reduce the number of metering pumps required, since a metering pump is used for metering from two storage containers. As a result, the control effort can be reduced.

The metering pump with exchangeable pumping direction is preferably designed as a volume pump. For example, the metering pump can be designed as a gear pump. Changing the pumping direction can be done for example by reversing the polarity. In this case, for example, the activation with a positive voltage can bring about an operation in the one pumping direction and a triggering with a negative activation voltage can bring about an operation in the other pumping direction.

A flowable treatment agent is to be understood as a treatment agent which is used for one can be dosed in suitable amounts and on the other hand is funded by the metering pump. Specifically, such a treating agent may be configured as a liquid treating agent of suitable viscosity. In this case, however, pulverulent constituents may also be contained in the flowable treatment agent. Examples of such flowable treatment agents are a detergent and a fabric softener, which are stored in the storage containers and are metered at different times. However, the dosage of the two treatment agents may also relate to a single treatment step. An example of this is a detergent composed of components, in which the components are metered individually, for example with regard to degree of soiling and water hardness.

It is advantageous that a further valve is provided which has a first input, a second input and an output, wherein the output in a first position of the further valve with the first input and in a second position of the further valve with the second input is connected, that the first port of the metering pump is connected to the first input of the further valve and that the second port of the metering pump is connected to the second input of the further valve. As a result, both the first treatment agent and the second treatment agent can be guided via the outlet of the further valve. By the two positions of the other valve in each case the respectively unnecessary branch can be locked. Thus, a check valve can be saved.

It is also advantageous here that the further valve is designed as a piston valve, in which a sealing effect is ensured even when switching between the first position and the second position. In this way, a temporary connection between the two outputs of the further valve can be avoided when switching. As a result, a media separation in the region of the other valve is ensured.

However, it is also advantageous that a third directional valve is provided, that an input of the third directional valve is connected to the first port of the metering pump, that a fourth directional valve is provided and that an input of the fourth directional valve is connected to the second port of the metering pump. As a result, when changing the pumping direction of the metering pump, the previously selected path can be blocked via the third directional valve or the fourth directional valve and the other path, d h. via the fourth directional valve or the third directional valve.

It is also advantageous that a purging device is provided, via which rinse water can be guided to the first connection of the dosing pump. If the dosing pump is switched off when supplying rinse water, then an outlet side, for example via the third directional valve or the other valve, can be rinsed. By operating the metering pump in the first pumping direction then the other output side can be flushed. Optionally, it is also possible that by operating the metering pump in the second pumping direction, the second treatment agent is conveyed and mixed after passing through the metering pump with the rinse water. As a result, a mixture of the second treatment agent and the rinse water is still possible within the metering system. This is particularly advantageous when fresh water is supplied as rinse water.

It is also advantageous here for the metering pump to have a delivery rate at which a volume flow is generated from the first connection of the metering pump to the second connection of the metering pump, which is smaller than a volume flow of the flushing water fed via the flushing device to the first connection of the metering pump , This ensures that when operating the metering pump in the first pumping direction, the first directional valve remains closed when rinse water is supplied.

It is also advantageous that the purging device has a line in which a check valve and / or a directional valve are arranged. Here, it is also advantageous that the line of the flushing device is viewed in a conveying direction of the first treatment means behind the first directional valve connected directly to the first port of the metering pump. This results in a simple embodiment, in which reliably blocks the first directional valve when supplying the rinse water.

However, it is also advantageous for the first directional valve to have a valve space and a valve closing body arranged in the valve space, and for the line of the flushing device to open into the valve space, the flushing water from the flushing device via the valve space of the first directional valve to the first space being closed when the first directional valve is closed Connection of the metering pump is feasible. In this embodiment, when supplying fresh water and the valve chamber of the first directional valve can be flushed, wherein the first directional valve blocks. As a result, a substantial separation of media between the treatment agents is possible.

It is also advantageous that a first upstream directional valve is provided, via which the first treatment agent from the first Reservoir is conveyed to the first directional valve, and that the line of the purging device opens into a connection between the first upstream directional valve and the first directional valve. This arrangement ensures that after rinsing any contaminated parts of the system are not part of the shared line area, so that cross-contaminations are excluded. Specifically, in a symmetrical configuration, a second upstream directional valve can be provided, via which the second treatment agent from the second reservoir to the second directional valve is conveyed, wherein a line of the purging device opens into a connection between the second upstream directional valve and the second directional valve.

It is also advantageous that the flushing device has a switching valve, that in a first switching position of the switching valve, the flushing water to the first port of the metering pump is feasible and that in a second switching position of the switching valve, the flushing water to the second port of the metering pump is feasible. In this way, a symmetrical configuration can be achieved, in which a substantial flushing is possible both with respect to the first treatment agent and with respect to the second treatment agent.

Preferred embodiments of the invention are explained in more detail in the following description with reference to the accompanying drawings, in which corresponding elements are provided with corresponding reference numerals. Show it:

1 a water-conducting household appliance in a partial, schematic sectional view according to a first embodiment of the invention;

2 a water-conducting household appliance in a partial, schematic sectional view according to a second embodiment of the invention;

3 a water-conducting household appliance in a partial, schematic sectional view according to a third embodiment of the invention;

4 a water-conducting household appliance in a partial, schematic sectional view according to a fourth embodiment of the invention;

5 a water-conducting household appliance in a partial, schematic sectional view according to a fifth embodiment of the invention;

6 a water-conducting household appliance in a partial, schematic sectional view according to a sixth embodiment of the invention and

7 a water-conducting household appliance in a partial, schematic sectional view according to a seventh embodiment of the invention.

1 shows a water-conducting household appliance 1 in a partial, schematic sectional view according to a first embodiment of the invention. The water-bearing household appliance 1 especially as a laundry treatment device 1 be configured and used for washing and / or drying laundry. Specifically, the water-bearing household appliance 1 be designed as a washing machine or washer-dryer. The water-bearing household appliance 1 However, the invention is also suitable for other applications, in particular, it can be configured as a dishwasher.

The water-bearing household appliance 1 has a first reservoir 2 for receiving a first treatment agent 3 serves, and a second reservoir 4 for receiving a second treatment agent 5 serves. The treatment agents 3 . 5 are here flowable treatment agents 3 . 5 , In particular, the treatment agents 3 . 5 as a liquid treatment agent 3 . 5 be educated. The flowable treatment agent 3 . 5 However, they may also have powdered ingredients or the like.

The water-bearing household appliance 1 also has a dosing pump 6 which can be operated both in a first pumping direction and in a second pumping direction. Thus, it is the metering pump 6 to a metering pump 6 with changeable pumping direction 7 . 8th , For example, the change of the pumping direction 7 . 8th be effected by a change of direction.

The dosing pump 6 has a first connection 9 and a second connection 10 on. The first reservoir 2 is via a first directional valve 11 with the first connection 9 the dosing pump 6 connected. The second reservoir 4 is via a second directional valve 12 with the second connection 10 the dosing pump 6 connected. When the metering pump 6 in the first pumping direction 7 operated, then this promotes the first treatment agent 3 from the first reservoir 2 over the first directional valve 11 to the second port 10 , Conversely, the metering pump promotes 6 in the second pumping direction 8th the second treatment agent 5 from the second reservoir 4 via the second directional valve 12 to the first port 9 ,

In this embodiment, the water-conducting household appliance 1 also a third directional valve 13 and a fourth directional valve 14 on. The directional valves 11 to 14 each have an entrance 11 ' . 12 ' . 13 ' . 14 ' on. In addition, the directional valves point 11 to 14 one output each 11 '' . 12 '' . 13 '' and 14 '' on.

In the case of the 1 described water-conducting household appliance 1 is the entrance 11 ' the first directional valve 11 the first reservoir 2 assigned. The exit 11 '' the first directional valve 11 is with the first connection 9 the dosing pump 6 connected. The entrance 13 ' the third directional valve 13 is both with the first connection 9 the dosing pump 6 as well as with the exit 11 '' the first directional valve 11 connected. The entrance 12 ' the second directional valve 12 is the second reservoir 4 assigned. The exit 12 '' the second directional valve 12 is with the second connection 10 the dosing pump 6 connected. The entrance 14 ' the fourth directional valve 14 is both with the second port 10 as well as with the exit 12 '' the second directional valve 12 connected. Each of the directional valves 11 to 14 is in the direction of its respective entrance 11 ' to 14 ' to its respective output 11 '' to 14 '' permeable and locks in the opposite direction.

When the metering pump 6 in the first pumping direction 7 promotes, then becomes the first treatment agent 3 with the pump pressure to the second port 10 promoted. This pressure causes the second directional valve 12 remains in its blocking position while the fourth directional valve 14 is opened. In addition, the suction side of the metering pump is located 6 then at the first port 9 , This leaves the third directional valve 13 locked, while according to the delivery volume of the metering pump 6 the first treatment agent 3 is further promoted. Thus, the first treatment agent becomes 3 at the exit 14 '' the fourth directional valve 14 output. The dosing quantity can be determined by the delivery volume of the dosing pump 6 be specified. The dosage is thereby arbitrarily dosed.

In a corresponding manner, the second treatment agent 5 from the second reservoir 4 via the second directional valve 12 and the third directional valve 13 to the exit 13 '' be promoted when the metering pump 6 in the second pumping direction 8th is operated.

Thus, with only one metering pump 6 the promotion of two treatment agents 3 . 5 take place in any desired dosage. The contact of the two treatment agents 3 . 5 is low here. In particular, an entry of the first treatment agent 3 in the second reservoir 4 through the second directional valve 12 reliably prevented. Accordingly, the second treatment agent 5 not in the first reservoir 2 reach. The mixing amount is essentially limited to the line cross section, with a small mixture only when changing the pumping direction 7 . 8th the dosing pump 6 occurs.

2 shows a water-conducting household appliance 1 in a partial, schematic sectional view according to a second embodiment of the invention. In this embodiment, a line 20 provided, via a check valve 21 Fresh water from a fresh water pipe 22 can be supplied. The administration 20 The fresh water in this embodiment leads to the first port 9 the dosing pump 6 , With the fresh water supplied in this way, a partial flushing of the system can take place. With stationary dosing pump 6 may be the third directional valve 13 be rinsed. Will the metering pump 6 in the first pumping direction 7 operated, then also can the fourth directional valve 14 be rinsed. Here, the respective line sections are flushed. Thus, an optionally undesirable mixture of the treatment agents 3 . 5 be further reduced.

In addition, the fresh water line allows 22 the supply of fresh water. Here is also a mixture of the fresh water with the second treatment agent 5 possible, if provided with open check valve 22 at the same time the dosing pump 6 in the second pumping direction 8th is operated.

When feeding fresh water and simultaneously operating the dosing pump 6 is the flow rate of the metering pump 6 or the delivery pressure set appropriately. Especially during operation of the metering pump 6 in the first pumping direction 7 the delivery volume is limited to that of the open check valve 21 at the first connection 9 applied water pressure is sufficient to the first directional valve 11 to keep closed.

3 shows a water-conducting household appliance in a partial, schematic sectional view according to a third embodiment of the invention. In contrast to that on the basis of 2 described second embodiment is a Rücksaugsicherung in this embodiment 23 in the pipe 20 arranged. The Rücksaugsicherung 23 is here as a check valve 23 and thus as directional valve 23 designed. This is a closed Rücksaugsicherung 23 educated. This ensures that the dosing system is not ventilated. This would not be the case with an open backwash system operating, for example, over an air gap, with a venturi, or with a breather pipe bend.

Based on 2 and 3 are thus possible embodiments for purging devices 24 described, wherein such a purging device 24 may also have other components. The rinsing device 24 can also work with other liquids, especially a cached water, instead of fresh water.

4 shows a water-conducting household appliance 1 in a partial, schematic sectional view corresponding to a fourth embodiment. In this embodiment, the water-conducting household appliance 1 another valve 30 on. The other valve 30 has a first entrance 31 , a second entrance 32 and an exit 33 on. In a first position of the other valve 30 is the exit 33 with the first entrance 31 connected. In a second position of the other valve 30 is the exit 33 with the second entrance 32 connected. The other valve 30 is thus a double valve 30 designed. The other valve 30 has a sealing element 34 on. The sealing element 34 can be used as a spherical sealing element 34 be designed. The sealing element 34 can seal on both sides depending on the flow and / or pressure conditions and preferably leaves only one of the treatment agent in the first switching position or the second switching position 3 . 5 by. The respective opposite line is thus closed off. Here, the sealing element 34 also as a piston-shaped sealing element 34 be designed to achieve a sealing effect over the entire travel. The sealing effect is then achieved not only when applied to the sealing seats.

The other valve 30 can advantageously replace two directional valves, for example, the third directional valve 13 and the fourth directional valve 14 as they are in the 1 to 3 are shown.

The first entrance 31 the further valve 30 is in this embodiment with the first port 9 as well as with the exit 11 '' the first directional valve 11 connected. Here, in this embodiment, a connection with the line 20 the rinsing device 24 given. The second entrance 32 the further valve 30 is both with the second port 10 the dosing pump 6 as well as with the exit 12 '' the second directional valve 12 connected. The actuation of the sealing element 34 the further valve 30 can in this case on the delivery pressure of the metering pump 6 in the selected pumping direction 7 . 8th respectively. However, the other valve can 30 if necessary, also be activated.

5 shows a water-conducting household appliance 1 in a partial, schematic sectional view according to a fifth embodiment of the invention. In this embodiment, another rinsing device 35 provided that a line 36 includes. There is also a first upstream directional valve 37 and a second upstream directional valve 38 intended. The first upstream directional valve 37 has an entrance 37 ' , the first storage tank 2 is assigned, and an output 37 '' on that with the entrance 11 ' the first directional valve 11 connected is. In addition, the line flows 20 the rinsing device 24 in the connection between the first upstream directional valve 37 and the first directional valve 11 ,

The second upstream directional valve 38 accordingly has an entrance 38 ' and an exit 38 '' on. The entrance 38 ' is the second reservoir 4 assigned. The exit 38 '' is with the entrance 12 ' the second directional valve 12 connected. In addition, the line flows 36 the further flushing device 35 in the connection 40 between the second upstream directional valve 38 and the second directional valve 12 ,

Thus, the first treatment agent 3 from the first reservoir 2 over the first upstream directional valve 37 and the first directional valve 11 through the dosing pump 6 to the second port 10 recoverable when the dosing pump 6 in the first pumping direction 7 is working. The first treatment agent 3 will then go over the exit 14 '' the fourth directional valve 14 output. Accordingly, the second treatment agent 5 from the second reservoir 4 to the exit 13 '' the third directional valve 13 be promoted when the metering pump 6 in the second pumping direction 8th is working. In this embodiment, there is the advantage that by the purging devices 35 . 36 the first directional valve 11 , the second directional valve 12 , the third directional valve 13 , the fourth directional valve 14 , the dosing pump 6 as well as between these components 6 . 11 to 14 existing compounds can be flushed. This allows a contact between the two treatment agents 3 . 5 be prevented. After rinsing still with one of the treatment agents 3 . 5 contaminated components, in particular the upstream directional valves 37 . 38 , are not part of the shared line. Cross-contamination is excluded.

A significant advantage of this variant is also that you can supply the flushing system from a single supply line. In this case, the flushing devices 24 and 35 connected in parallel. Without the two valves 11 and 12 (As in the embodiment with symmetrical Spülwasserbeaufschlagung), would result in the connection of the two flushing channels, a short circuit of the pump, with correspondingly prevented / reduced and inaccurate fluid delivery. Through the two valves 11 and 12 is avoided over the self-adjusting pressure conditions of this short circuit.

6 shows a water-conducting household appliance 1 in a partial, schematic sectional view according to a sixth embodiment. The first directional valve 11 has a valve chamber 45 and one in the valve room 45 arranged valve closing body 46 on. In addition, in this embodiment, in the valve space 45 a spring element 47 arranged, which is the valve closing body 46 towards the entrance 11 ' the first directional valve 11 applied. In a starting position of the first directional valve 11 closes the valve closing body 46 hence the entrance 11 ' the first directional valve 11 while from the valve room 45 seen from the exit 11 '' is open.

The administration 20 the rinsing device 24 is in this embodiment to the first directional valve 11 connected. This leads to the line 20 in the valve room 45 , In the starting position, in which the valve closing body 46 at the entrance 11 ' This can be done with the check valve open 21 over the line 20 in the valve room 45 the first directional valve 11 guided fresh water over the exit 11 '' the first directional valve 11 flow away.

In this way, an improved flushing is possible. For example, is the metering pump 6 , then not only the third directional valve 13 but also the valve space 45 the first directional valve 11 be rinsed. Will the metering pump 6 in the second pumping direction 8th actuated, then there is also an additional flushing of the valve chamber 45 the first directional valve 11 ,

In a similar way, a valve chamber 48 the second directional valve 12 be rinsed. For this example, the line 36 another rinsing device 35 as they are in the 5 is illustrated in the valve chamber 48 the second directional valve 12 lead. In this way, cross-contamination between the two treatment agents 3 . 5 be prevented.

Generally, by at least one rinsing device 24 . 35 a supply of fresh water take place in order to realize a Einspülleitung for the dosing system. This can automatically after each dosing, through which the treatment agent to be dosed 3 . 5 be rinsed in a tub or the like, a cleaning done.

7 shows a water-conducting household appliance 1 according to a seventh embodiment. In this embodiment, a purging device 24 with a Rücksaugsicherung 23 intended. The rinsing device 24 also has a switching valve in this embodiment 50 on, being an entrance 51 the switching valve 50 with the line 20 connected is. Thus, the switching valve 50 with the shut-off valve open 21 over the Rücksaugsicherung 23 Fresh water to be supplied. The switching valve 50 has a first exit 52 and a second exit 53 on. Here, the switching valve has 50 two switch positions. In the first switching position is the input 51 with the first exit 52 connected. In the second switching position is the input 51 with the second exit 53 connected. The first exit 52 the switching valve 50 is at least indirect with the first port 9 the dosing pump 6 connected. Further, the second exit 53 the switching valve 50 at least indirectly with the second port 10 the dosing pump 6 connected. In this embodiment, the first output 52 the switching valve 50 over a line 54 with the first directional valve 11 connected. The administration 54 opens into the valve chamber 45 the first directional valve 11 , Thus, in the first switching position of the switching valve 50 the fresh water or another rinse water to the first port 9 the dosing pump 6 feasible, with the first directional valve 11 is rinsed.

Accordingly, the second output 53 the switching valve 50 over a line 55 with the second directional valve 12 connected, the line 55 in the valve room 48 empties. As a result, in the second switching position, the fresh water or another rinse water over the valve chamber 48 to the second port 10 the dosing pump 6 feasible. Thus, there is an at least indirect connection of the second output 53 the switching valve 50 with the second connection 10 the dosing pump 6 wherein the connection in this case by means of the valve space 48 he follows.

For dosing, the dosing pump 6 in the suitable pumping direction 7 . 8th actuated. As a result, either the first treatment agent 3 or the second treatment agent 5 to the other valve 30 be guided. This results in a common output through the output 33 the further valve 30 , The exit 33 the further valve 30 is over a line section 56 with a container 57 , in particular a tub 57 connected. The tub 57 surrounds a treatment area 58 into which the respective treatment agent 3 . 5 and the rinse water is passed. In this case, the system can be largely rinsed, so that a mixture of the treatment agent 3 . 5 can be prevented.

The other valve 30 can as a double valve 30 be configured, which is spring loaded on both sides. A starting position of the sealing element 34 This can be between the two inputs 31 . 32 are located. Thus, at the flow rate, a backpressure for the treating agents due to the valve springing becomes 3 . 5 and generated for the supplied fresh water.

The switching valve 50 can be switched via a controller. The dosing pump 6 can as a gear pump 6 be designed.

If a dosage is done, then the metering pump 6 in the respective required pumping direction 7 . 8th operated, within certain tolerances the required amount is metered. Subsequently, water can flow through the pipes 54 . 55 fed to the system so that the dosed treatment agent 3 . 5 completely in the treatment area 58 is rinsed.

It is advantageous if the metering pump 6 continues or is activated again. In addition, it makes sense if the volume flow of the rinse water is significantly higher than that of the metering pump 6 , This rinses the system completely and replaces any residues with the rinse water. Specifically, at each start of a dosing process, the respectively unneeded branch of the system from the previous cleaning process can be filled with water. With only one-sided supply of fresh water can by simultaneous addition of the fresh water and the operation of the metering pump 6 for the treatment agent 3 . 5 a good mixing with the water can be achieved directly within the system.

The of the dosing pump 6 generated back pressure divides depending on the active pumping direction 8th or 7 over the line 54 or 55 the switching valve 50 with and pushes the ball into position 53 or 52 , Because in this switching valve 50 no restoring element (such as spring) is provided, the switching valve remains 50 in this last position, especially when the dosing pump is switched off 6 and possibly from the over the entrance 51 stabilized inflowing rinsing liquid in this position. This allows the channel to be purged by previously activating the metering pump 6 in the appropriate direction. It would thus be by a suitable order of the control of metering pump 6 and a flush valve even a mixing of dosing substance and water for both channels feasible.

If the rinsing device 24 only one-sided connected, as it is based on the 2 . 3 . 4 . 5 and 6 is described, then at least for the second treatment agent 5 a reliable mixing can be ensured. At the same time the metering pump 6 activated as well as the check valve 21 open. In this case, the second treatment agent 5 the main substance used, especially a detergent.

The described directional valves 11 to 14 . 37 . 38 can be configured as spring-loaded valves. In this case, the spring does not necessarily have to be accommodated in a large chamber in the downstream part of the valve. There are also valve variants with tension springs or bending springs conceivable, wherein the springs may optionally be accommodated in the upstream part and not in the downstream part of the respective valve. In particular, this valve variants are possible in which the valve closing body 46 is configured by a suitably shaped portion of a soft-elastic membrane. The design as a check valve, in which exclusively or additionally switch flow or pressure forces, is also possible. In addition, external forces, in particular gravity or magnetic forces, can be used.

That on the basis of 7 described supplying fresh water through the flushing device 24 can by different embodiments of the switching valve 50 will be realized. Here, the switching valve 50 not only externally controlled. Possible, for example, a mechanical coupling with the other valve 30 , Specifically, a combined valve 30 . 50 be realized, in which a common piston is used for synchronous switching. This can be done by the metering pump 6 Applied pressure in a suitable manner, the switching valve 50 be switched. During the subsequent supply of fresh water is then also on the fresh water pressure, the switching valve 50 held in the current switching position.

It is also possible to build a Dosiergegendrucks for switching such a Spülwasserdoppelventils by installing a throttle point.

In addition, an embodiment with respect to a preferred treatment agent 3 . 5 possible. This will be one of the treatment agents 3 . 5 considered as a preferred treatment agent and the system designed for the dosage of this. Here, the individual components, in particular the valves, have a preferred direction, the for example, by springs, gravity or magnetic fields is maintained. As a result, there is no initial build-up of pressure in the system for switching over the rinse water valve 50 serving switching valve 50 required. In particular, when dosing the preferred treatment agent 3 . 5 the water-bearing household appliance works 1 then faster and less demanding. In addition, the system can be kept more easily depressurized.

In addition, a mixing chamber may be provided, for example in the line section 56 , As a result, the rinse water with the metered treatment agent 3 . 5 be mixed intensively. This is passive, for example, by a labyrinth mixer, or active, for example by a circular chamber in which circulates through the water flow a mixing ball, possible.

In addition, the individual components, in particular the valves, can be provided in-wall with a non-stick coating, so that adhering residues are reduced to a minimum. Further, a regular and / or driven by the user running through a cleaning program with fresh water addition and metering pump operated changing pumping directions 7 . 8th be performed. Furthermore, the housing of the metering pump 6 together with one or more valves or an additional valve and manifold block made of substantially three parts. Here, a soft elastic sealing part and two housing halves can be used. By correspondingly shaped recesses and stops in the housing halves check valves can be formed very easily together with a soft elastic membrane pressed in between with suitably shaped tongue-like sections. In this integrated design, it is possible to accommodate a larger number of valves together with the appropriate conduit and pump chamber, which is necessary in the case of a gear pump, and other components, such as a labyrinth mixer, in a highly integrated assembly of only three parts.

Also possible is an electrical control of the metering pump 6 via rectifier diodes, which allows an electrically completely compatible control concept to known controls.

Thus, compared to two substance metering systems with two metering pumps, the manufacturing costs can be reduced. This also applies to a larger number of treatment agents, as especially with an even number of storage containers 2 . 4 the number of required dosing pumps 6 halved. For switching the pumping direction 7 . 8th the dosing pump 6 A reversal of the voltage supply may be sufficient, for example in gear pumps. The cleaning system can be combined with a flushing system. This allows a thorough mixing of at least one of the treatment agents 3 . 5 already done in the dosing with the fresh water. Another advantage is the high integrability of all important functions in a substantially consisting of three components module. On the control side, this is largely compatible with conventional two-substance metering systems. This allows an application in conventional systems with little adaptation effort.

LIST OF REFERENCE NUMBERS

1

Water-conducting household appliance

2

first storage tank

3

first treatment agent

4

second reservoir

5

second treatment agent

6

metering

7

first pumping direction

8th

second pumping direction

9

first connection

10

second connection

11

first directional valve

12

second directional valve

13

third directional valve

14

fourth directional valve

11'-14 '

entrance

11 '' - 14 ''

output

20

management

21

check valve

22

Fresh water pipe

23

Rücksaugsicherung

24

flushing

30

another valve

31

first entrance

32

second entrance

33

output

34

sealing element

35

further rinsing device

36

management

37

first upstream directional valve

38

second upstream directional valve

37 ', 38'

entrance

37 '', 38 ''

output

39

connection

40

connection

45

valve chamber

46

Valve closing body

47

spring element

48

valve chamber

50

switching valve

51

entrance

52

first exit

53

second exit

54, 55

management

56

line section

57

tub

58

treatment area

Claims (11)

Water-conducting household appliance ( 1 ), in particular laundry treatment device for washing and / or drying laundry, with a first storage container ( 2 ) for receiving a first flowable treating agent ( 3 ), and a second storage container ( 4 ) suitable for receiving a second flowable treating agent ( 5 ), characterized in that a metering pump ( 6 ) with changeable pumping direction ( 7 . 8th ) is provided that the first reservoir ( 2 ) via a first directional valve ( 11 ) with a first connection ( 9 ) of the dosing pump ( 6 ), that the second reservoir ( 4 ) via a second directional valve ( 12 ) with a second connection ( 10 ) of the dosing pump ( 6 ), that the metering pump ( 6 ) in a first pumping direction ( 7 ) the first treatment agent ( 3 ) from the first reservoir ( 2 ) via the first directional valve ( 11 ) to the second port ( 10 ) of the dosing pump ( 6 ) and that the metering pump ( 6 ) in a second pumping direction ( 8th ) the second treatment agent ( 5 ) from the second reservoir ( 4 ) via the second directional valve ( 12 ) to the first connection ( 9 ) of the dosing pump ( 6 ) promotes. Water-conducting domestic appliance according to claim 1, characterized in that a further valve ( 30 ), which has a first input ( 31 ), a second input ( 32 ) and an output ( 33 ), the output ( 33 ) in a first position of the further valve ( 30 ) with the first input ( 31 ) and in a second position of the further valve ( 30 ) with the second input ( 32 ), that the first connection ( 9 ) of the dosing pump ( 6 ) with the first input ( 31 ) of the further valve ( 30 ) and that the second connection ( 10 ) of the dosing pump ( 6 ) with the second input ( 32 ) of the further valve ( 30 ) connected is. Water-conducting domestic appliance according to claim 2, characterized in that the further valve ( 30 ) as a piston valve ( 30 ) is configured, in which a sealing effect is ensured even when switching between the first position and the second position. Water-conducting domestic appliance according to claim 1, characterized in that a third directional valve ( 13 ) is provided that an input ( 13 ' ) of the third directional valve ( 13 ) with the first connection ( 9 ) of the dosing pump ( 6 ), that a fourth directional valve ( 14 ) and that an entrance ( 14 ' ) of the fourth directional valve ( 14 ) with the second connection ( 10 ) of the dosing pump ( 6 ) connected is. Water-conducting domestic appliance according to one of claims 1 to 4, characterized in that a flushing device ( 24 ) is provided, via the rinse water to the first port ( 9 ) of the dosing pump ( 6 ) is feasible. Water-conducting household appliance according to claim 5, characterized in that the metering pump ( 6 ) has a delivery rate at which a volume flow from the first port ( 9 ) of the dosing pump ( 6 ) to the second port ( 10 ) of the dosing pump ( 6 ) is generated, which is smaller than a volume flow of the purging device ( 24 ) to the first port ( 9 ) of the dosing pump ( 6 ) guided rinse water. Water-conducting household appliance according to claim 5 or 6, characterized in that the rinsing device ( 24 ) a line ( 20 . 22 ), in which a check valve ( 21 ) and / or a Rücksaugsicherung ( 23 ) are arranged. Water-conducting household appliance according to claim 7, characterized in that the line ( 20 ) of the rinsing device ( 24 ) directly to the first port ( 9 ) of the dosing pump ( 6 ) connected is. Water-conducting domestic appliance according to claim 7, characterized in that the first directional valve ( 11 ) a valve space ( 45 ) and one in the valve space ( 45 ) arranged valve closing body ( 46 ) and that the line ( 20 ) of the rinsing device ( 24 ) in the valve space ( 45 ), wherein when the first directional valve ( 11 ) the rinsing water from the rinsing device ( 24 ) over the valve space ( 45 ) of the first directional valve ( 11 ) to the first port ( 9 ) of the dosing pump ( 6 ) is feasible. Water-conducting domestic appliance according to claim 7, characterized in that a first upstream directional valve ( 37 ), via which the first treatment agent ( 3 ) from the first reservoir ( 2 ) to the first directional valve ( 11 ) and that the management ( 20 ) of the rinsing device ( 24 ) into a connection ( 39 ) between the first upstream directional valve ( 37 ) and the first directional valve ( 11 ) opens. Water-conducting domestic appliance according to one of claims 5 to 10, characterized in that the flushing device ( 24 ) On-off valve ( 50 ), that in a first switching position of the switching valve ( 50 ) the rinse water to the first port ( 9 ) of the dosing pump ( 6 ) is feasible and that in a second switching position of the switching valve ( 50 ) the rinse water to the second port ( 10 ) of the dosing pump ( 6 ) is feasible.

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