WO2016185005A1

WO2016185005A1 - Laundry-care appliance having a detergent-solution pump

Info

Publication number: WO2016185005A1
Application number: PCT/EP2016/061377
Authority: WO
Inventors: Jörg SKRIPPEK; Rainer Jurmann; Dirk MISCHKE; Raymond Römer
Original assignee: BSH Hausgeräte GmbH
Priority date: 2015-05-21
Filing date: 2016-05-20
Publication date: 2016-11-24
Also published as: CN107683355B; DE102015209287B3; TR201907495T4; EP3298189A1; PL3298189T3; EP3298189B1; CN107683355A; RU2676010C1

Abstract

The invention relates to a laundry-care appliance (100), comprising a detergent-solution container (109) for holding detergent solution, wherein the detergent-solution container (109) comprises a drain opening (113) and an inlet opening (111), wherein the drain opening (113) is arranged below the inlet opening (111) and is connected to the inlet opening (111) by means of a line (115), wherein a detergent-solution pump (117) is arranged in the line (115), and comprising a controller (127) for controlling the detergent-solution pump (117). The controller (127) is designed to activate conveying operation of the detergent-solution pump (117) in a first time segment in order to pump detergent solution out of the detergent-solution container (109) through the drain opening (113) into the line (115) up to a detergent-solution level (131) in the line (115). The controller (127) is designed to stop the conveying operation of the detergent-solution pump (117) in a second time segment following the first time segment in order to transport the detergent solution out of the line (115) through the drain opening (113) back into the detergent-solution container (109).

Description

Laundry care device with a drain pump

The present invention relates to a laundry care device with a drain pump.

In conventional laundry care appliances, the laundry care fabric, such as e.g.

Detergent, given by the user in the dispenser shell of the laundry care device. Water is supplied to the dispenser tray through the water connection of the laundry care appliance, whereby the laundry care substance is washed out of the dispenser tray by the supplied water and supplied to the suds container. In the case of improper overdosage of laundry care substance by the user, the laundry care substance can not completely dissolve. Undissolved laundry care substance may under certain circumstances damage the laundry to be nourished in high concentrations.

CN 202152418 U discloses a pumping device with a foam producing tank for producing foam for a washing machine. The device enables the rapid dissolution of liquid detergent to form detergent foam.

It is the object of the present invention to provide a laundry care device in which an advantageous dissolution of the Wäschepflegesubstanz in the wash liquor

is ensured.

This object is achieved by an article having the features according to the independent claims. Advantageous embodiments are the subject of the dependent claims, the description and the drawings. According to one aspect, the object according to the invention is provided by a laundry care appliance with a suds container for holding suds, wherein the suds container comprises a discharge opening and an inlet opening, wherein the discharge opening is arranged below the inlet opening and is connected to the inlet opening by a line, wherein in the line Lysis pump is arranged, and a controller for controlling the drain pump solved, wherein the controller is configured to activate a conveying operation of the drain pump in a first period of time to wash liquor through the discharge opening from the tub in the line up to a To pump wash liquor level in the line, and wherein the controller is formed, in a subsequent to the first time period, the second time period

Adjusting the delivery mode of the drain pump to move the wash liquor from the line through the drain opening back into the tub. As a result, the technical advantage is achieved that by pumping out the wash liquor from the tub through the drain pump in the first period of time and the subsequent return of the pumped wash liquor in the

Lye container effective dissolution of undissolved residues of

Wäschepflegesubstanz is achieved in the wash. The advantageous dissolution of the Wäschepflegesubstanz is ensured by a strong convection of the wash liquor, which occurs in an active flow through the liquor pump through the wash liquor, the strong convection is particularly caused by the high flow velocities of the wash liquor at the pump impeller of the drain pump. In a conventional laundry care device laundry substance is in the

Dispenser bowl pre-dosed by the user. Through the water connection of the

Laundry care device, water is rinsed into the dispenser bowl and the mixture of laundry substance and water is rinsed through a filling line as a wash in the tub.

This can be due to improper dosage by the user in the

Washing liquor present laundry substance are not completely dissolved, so that undissolved residues of Wäschepflegesubstanz, e.g. powdered detergent, can remain in the wash. Undissolved residues of laundry detergent may be present in high concentrations on the laundry to be cared for

Discolouring damage and should therefore be avoided.

In a pumping system in a conventional laundry care device, the

Sucked out of the tub by means of the drain pump through the drain opening. The drain pump conveys the wash liquor in the line and leads the wash liquor through the inlet opening again to the tub. In a conventional pumping system in a washing machine is usually on a

Lye container seal dispensed with, and there are used additional components that Make sure that wash liquor flowing out of the drain opening is pumped again into the tub and thus not lost.

In the laundry care apparatus according to the invention, the drain pump pumps in the first period of time the wash liquor from the tub until the pumped

Washing liquor in the line has a wash liquor level. The resulting interruption of delivery prevents the pumped-off wash liquor from being supplied again to the tub during the first time period through the inlet opening. By preventing the supply of the wash liquor in the tub prevents any unresolved Wäschepflegesubstanz existing in the wash liquor during the first period of time comes into contact with the laundry in the washing drum and can damage the laundry.

After completion of the first time period is in the second period of the

Adjusted delivery mode of the drain pump, wherein the wash liquor is returned from the line through the discharge opening back into the tub. In this case, the level of the wash liquor in the line decreases.

By pumping and the return of the wash liquor during the first and second time period, there is an advantageous resolution of

Wäschepflegesubstanz in the wash liquor, whereby in a subsequent Umpumpvorgang the wash liquor of the laundry in the washing drum can be supplied without damage to the laundry by unresolved residues of

Wäschepflegesubstanz can occur. A laundry care appliance is understood to mean a device which is used for laundry care, such as e.g. a washing machine or a tumble dryer. In particular, such a laundry care appliance is understood as a household laundry care appliance. So a laundry care device, which is used in the context of household management, and is treated with the laundry in normal household quantities.

In an advantageous embodiment of the laundry care device, the inlet opening is arranged on the tub in an inlet height, the drain opening is at the Lye container disposed at a drain height, wherein the wash liquor level in the line between the inlet level and the drain level is.

This achieves the technical advantage of ensuring that during the first period of time the level of the wash liquor does not rise above the inlet level, whereby the wash liquor could be conveyed through the inlet opening into the tub and thus any unsolved matter which may be present in the wash liquor due to improper operation Remains of laundry substance could possibly lead to damage to the laundry. When the drain port is attached to the lowest point of the tub, the drain height on the tub is zero. The inlet opening may be located at the highest point of the tub, whereby the inlet height has a maximum value. The inlet opening can be attached at any height to the tub, provided that the inlet height has a value greater than the discharge height. In an advantageous embodiment of the laundry care appliance, the wash liquor has a further wash liquor level in the line after completion of the second time period, the further wash liquor level being lower than the wash liquor level, and the further wash liquor level corresponding in particular to the drain height. Thereby, the technical advantage is achieved that is lower than the wash liquor level by the further wash liquor level, it is ensured that wash liquor is transported from the line back into the tub. As a result of the wash liquor flowing back into the tub during the second time period, the level of the wash liquor in the conduit drops until after the end of the second time period a further wash liquor level in the conduit which is lower than the wash liquor level which was present after the end of the first time period. If a large part of the pumped-off wash liquor is conveyed back into the tub, then the further wash liquor level after the end of the second time period corresponds in particular to the drainage height.

In an advantageous embodiment of the laundry care device, the controller is designed to deactivate the drain pump in the second period of time. As a result, the technical advantage is achieved that the return of the wash liquor into the tub is not carried out by an active pumping of the tub pump, but by a backflow of the wash liquor due to the hydrostatic pressure of the wash liquor in the line. As a result, the drain pump does not have to be actively operated during the second time period, so that electrical energy can be saved.

In an advantageous embodiment of the laundry care device, the controller is designed to activate in the second period of time a further conveying operation of the drain pump in order to convey the wash liquor from the line through the drain opening back into the tub.

Thereby, the technical advantage is achieved that the return of the wash liquor into the tub is not carried out by a passive backflow due to the hydrostatic pressure of the wash liquor in the line but by an active pumping of the drain pump in a further conveying direction, the

Conveying direction during the first period is opposite. This allows the return of the wash liquor into the tub during the second

Time portion are controlled advantageously. In an advantageous embodiment of the laundry care device, the controller is configured to, after completion of the second time period, the first time period and the second time period adjoining the first time period

to repeat. As a result, the technical advantage is achieved that the wash liquor can be transported several times through the drain pump between the tub and the line by a simple or multiple repetition of the first and second time periods. This can reduce the efficiency of the resolution of unresolved remains of the

Wäschepflegesubstanz be improved in the wash.

In an advantageous embodiment of the laundry care appliance, this comprises

A laundry care device, a power detection element for detecting an electric power value of the drain pump, wherein the controller is formed, the detected to compare the electric power value of the drain pump with a reference power value of the drain pump, and wherein the controller is formed during a third time period subsequent to the second time period

Activate lye pump to expel wash liquor through the drain opening

To pump the tub and the wash liquor through the inlet opening in the

To carry tub when the detected electric power value coincides with the reference power value.

Thereby, the technical advantage is achieved that can be detected by comparing a detected electric power value of the drain pump with a reference power value as soon as the Wäschepflegesubstanz advantageous, in particular

completely dissolved in the wash liquor. This is the case when the

Reference power value coincides with the detected electric power value.

Once this is the case, the controller ends the second time period and initiates the third time period. During the third period, the drain pump is reactivated to start the pumping process, whereby wash liquor through the

Drain port is pumped out of the tub and fed through the inlet opening to the tub again. Since during the third period no or only small amounts of undissolved residues of Wäschepflegesubstanz in the

Washing liquor are present, there is no potential damage to the laundry in the washing drum when the wash wets the laundry.

The power sensing element is formed by the drain pump

to record consumed electrical power. If undissolved Wäschepflegesubstanz is present in the wash, increases by the higher pumping resistance of the

Washing liquor when pumping through the drain pump to the detected electrical power. The controller has a reference power value, which has been determined for the corresponding drain pump with a completely dissolved laundry care substance in the wash liquor, and which serves as reference value. By comparing the detected electrical power value with the reference power value, the controller can determine whether or not undissolved laundry care substance is present in the wash liquor. Thereby, by the power detection element and by the controller, it can be automatically recognized when the second time period is ended and after the advantageous dissolution of the Wäschepflegesubstanz the Umpumpvorgang can be initiated during the third period.

In an advantageous embodiment of the laundry care appliance, this comprises

Power detection element, a current sensor for detecting a supply current of the drain pump.

This achieves the technical advantage that by using the

Current sensor, the electrical power of the drain pump can be detected without the need to install another sensor element in the laundry care device. The current sensor comprises a switching resistor which controls the supply current of the

Lye pump detected during a time interval. In particular, an amplitude of the alternating current can be detected by the current sensor. The supply current of the drain pump is dependent on the amount of wash liquor pumped through the drain pump. If undissolved Wäschepflegesubstanz is present in the wash liquor, which is sucked in by the drain pump, then there is an increase in the detected electrical power of the drain pump.

In an advantageous embodiment of the laundry care device, the controller is designed to operate the drain pump with a first pumping power during the first time section and with a further pumping power during the third time section, wherein the further pumping power is higher than the first pumping power.

As a result, the technical advantage is achieved that an effective pumping over of the wash liquor in the pumping system during the third time period is ensured by the higher pumping capacity of the drain pump compared to the first pumping power during the third time period. During the first period, the wash liquor is pumped only to the wash liquor level in the line, which requires less pumping power. During the third period, however, the wash liquor is returned to the tub through the conduit and through the inlet opening, requiring a higher pumping capacity.

In an advantageous embodiment of the laundry care appliance, this comprises

Laundry care device a level sensor for detecting a level of wash in the line, wherein the controller is configured to terminate the first time period as soon as the detected level of wash liquor corresponds to the wash liquor level.

As a result, the technical advantage is achieved by the level sensor

automatic transition from the first period to the second period is ensured. The controller can determine from the detected level of wash liquor when the pumped wash liquor has reached the wash liquor level in the line and can then stop the pump down process. This can prevent the drain pump from pumping the pumped wash liquor out of the tub beyond the wash liquor level and the pumped out

Washing liquor is thereby again conveyed through the inlet opening again into the tub during the first period.

In an advantageous embodiment of the laundry care device, the wash liquor in the tub at the beginning of the first period has a first level of containers, wherein the first level of containers in the tub in a first container height, and the wash liquor in the tub after completion of the first

Time portion to a second container level, wherein the second container level is in the tub in a second container height, and wherein the second container height is less than the first container height.

As a result, the technical advantage is achieved that decreases by pumping out the wash liquor from the tub through the drain pump during the first period of the container level of the wash liquor in the tub. The fall of the

Container level in the tub correlates with an effective pumping out of the wash liquor from the tub.

In an advantageous embodiment of the laundry care appliance, the wash liquor has a further wash liquor level in the line after completion of the second time period, wherein the further wash liquor level is lower than the wash liquor level, and wherein the further wash liquor level in the conduit corresponds to the second vessel height. As a result, the technical advantage is achieved that after switching off the

Lye pump during the second period, the pumped wash liquor from the line through the discharge opening is not completely returned to the tub, but partly remains in the line. This establishes a balance between the second tank level of the wash liquor in the

Lye container and the further wash liquor level of the wash liquor in the line.

In an advantageous embodiment of the laundry care appliance, the drain pump has a pressure side and a suction side, wherein the wash liquor is pumped through the line from the suction side to the pressure side of the drain pump during the first time period, and wherein the wash liquor during the second time period from the pressure side to the Suction side of the drain pump is transported back through the line.

As a result, the technical advantage is achieved that by the arrangement of

Laugenpumpe with the pressure side and the suction side in the line an effective pumping out of wash liquor from the tub in the line and an effective Rückbefördern the wash liquor from the line is ensured in the tub.

In an advantageous embodiment of the laundry care appliance, the line comprises a first line section between the drain opening and the drain pump and a second line section between the drain pump and the inlet opening, wherein the first line section has a different diameter than the second

Having line section. Thus, the technical advantage is achieved by the different

Diameter of the first line section relative to the second line section advantageous hydraulic properties of the pumping system can be adjusted. In particular, can be ensured by a large diameter of the first line section that a large amount of wash liquor can be pumped out of the tub in the first period.

According to a second aspect of the invention, the object is achieved by a method for maintaining laundry in a laundry care appliance with a tub Pickup of wash liquor, wherein the tub comprises a drain opening and an inlet opening, wherein the drain opening below the inlet opening

arranged and connected to the inlet opening by a line, wherein a drain pump is arranged in the line, and having a control for controlling the drain pump, the method, the activation of a delivery operation of the drain pump in a first period by the control of wash liquor through the drain opening from the tub in the line up to a

To pump wash liquor level in the line, and adjusting the delivery operation of the drain pump in a subsequent to the first period second

Period of time to convey the wash liquor from the line through the discharge opening back into the tub.

Thereby, the technical advantage is achieved that the sequence of activating the drain pump and setting the delivery mode of the drain pump and the correlated pumping, or the return of wash liquor, the advantageous dissolution of undissolved Wäschepflegesubstanz in the wash liquor is enabled, thereby preventing undissolved Wäschepflegesubstanz comes into contact with the laundry in the washing drum.

Further embodiments will be explained with reference to the accompanying drawings. Show it:

Fig. 1 is a schematic view of a laundry care device;

FIG. 2 shows a schematic view of a laundry care device with a pumping system; FIG. and

Fig. 3 shows a sequence of a method for maintaining laundry in one

Laundry care device. Fig. 1 shows a schematic view of a general laundry care device 100, such as a washing machine. The laundry care appliance 100 comprises an induction bowl 101, into which wash-care substance, such as, for example, detergent, can be introduced. The Laundry-care appliance 100 comprises a door 103 for loading the laundry-care appliance 100 with laundry.

Fig. 2 shows a schematic view of a laundry care device with a

Pump system. The laundry care device 100 comprises a pumping system 105 with a washing drum 107 for receiving laundry, a washing tub 109 for receiving washing liquor, which comprises an inlet opening 11 and an outlet opening 13. The inlet port 1 1 1 and the discharge port 1 13 are connected by a line 1 15, wherein in the line 1 15 a drain pump 1 17 is arranged to

Siphon through the drain port 1 13 from the tub 109 and pump the pumped wash liquor through the inlet port 1 1 1 again in the tub 109. The line 1 15 comprises between the drain opening 1 13 and the drain pump 1 17, a first line section 1 19 and between the drain pump 1 17 and the inlet opening 1 1 1 a second line section 121. The user of laundry care equipment 100 gives Wäschepflegesubstanz such.

Detergent in the dispenser 101 of the laundry care device 100. By the

Water connection of the laundry care device 100, water is fed into the dispenser 101, wherein the resulting water-Wäschepflegesubstanz-mixture through a filling line 123 to the tub 109 and collected in a lower portion of the tub 109 near the discharge port 1 13 collects. After supplying the water-Wäschepflegesubstanz mixture to the tub 109, the

Mixes a first container level 125 in the tub 109.

During the washing process, the washing drum 107 is moved and it comes by diffusion and convection processes to dissolve the Wäschepflegesubstanz, whereby wash liquor is formed. Through small openings in the jacket of the washing drum 107 or through gill-like openings of the drum driver, the wash liquor can penetrate into the washing drum 107 and wet the laundry in the washing drum 107. Through the openings it is ensured that only completely dissolved wash liquor comes into contact with the laundry and no undissolved residues of laundry care substance come into contact with the laundry. Because unresolved highly concentrated

Laundry care substance on the laundry may cause discoloration damage, a good resolution of the laundry care substance is necessary to at improper feeding of Wäschepflegesubstanz into the dispenser 101 by the user to exclude damage to laundry in the washing process.

In a conventional laundry care device 100 without pumping system 105 is at the discharge port 1 13 usually a tub seal arranged to prevent inadvertent flow of wash liquor from the tub 109 through the discharge port 1 13, whereby in a missing Umpumpsystem 105th

Laundry care substance can be lost and the washing process can no longer be carried out with the expected washing result. In a pumping system 105, a tub seal is usually dispensed with and the loss of laundry care fabric is eliminated by a laundry process design, such as a laundry bag. through additional components, compensated for a favorable washing result

sure.

The present invention describes a pumping system 105, which manages without additional components to compensate for the loss of Wäschepflegesubstanz. The laundry care device 100 further comprises a controller 127, which by a

Control connection 129 is connected to the drain pump 1 17. The controller 127 is configured to operate the drain pump 1 17. At the start of the washing process, the controller 127 activates the drain pump 1 17 in a first period of time to pump off wash liquor through the drain port 1 13 and through the line 1 15 from the tub 109, wherein the pumped

However, do not wash over the inlet port 1 1 1 back into the

Lye container 109 is conveyed. Instead, builds on the pressure side of the

Lye pump 1 17 a water column in the line 1 15 on, after the first

Zeitanschnitt a wash liquor level 131 in the line 1 15 reaches, the

Wash liquor level 131 is below the height of the inlet opening 1 1 1, that is, the inlet level, is arranged. By pumping the wash liquor from the tub 109, the level of the wash liquor in the tub 109 decreases and reaches a second container level 133 in the tub 109 after the end of the first time period.

During a subsequent to the first period second period of time, the conveying operation of the drain pump 1 17 is set by the controller 127. As a result, the pressure-side pent-up wash liquor flows through the line 1 15 and through the discharge port 1 13 back into the tub 109 until an equilibrium of the suction side and the pressure-side water column in the line 1 15 sets, and the level of the wash liquor in the line. 1 15 after completion of the second

Period corresponds to a further wash liquor level 135. If the amount of the wash liquor in the pumping system 105 is low, then the other

Waschlaugenpegel 135 of the height of the discharge opening 1 13, and the discharge height, respectively.

After the second period of time has elapsed, the controller 127 may re-execute the first and the subsequent periods of time, causing it to resume

Pumping out of washing liquor from the tub 109 through the drain pump 1 17 and comes to a Rückbefördern the pumped out washing eye in the tub 109. The first and subsequent second period of time can be cyclically repeated several times in succession, which is characterized by the resulting

Convection dissolves undissolved Wäschepflegesubstanz in the wash liquor advantageous.

The laundry care device 100 may further include a power sensing element 137 that is connected to the drain pump 1 17 through a sensing link 139. The power sensing element 137, e.g. Current sensor, detects the electrical

Power value, e.g. Supply current, the drain pump 1 17. Due to a high temporal resolution in the motor torque detection, ie when detecting the

torque-forming current can be detected by the power sensing element 137, whether there are still undissolved residues of the laundry-care substance, e.g. powdery residues of detergent, in the liquor pump 1 17 pumped wash liquor. By comparing the detected electric power value of

Lye pump 1 17 with a reference power value of the liquor pump 1 17, the controller 127 can detect when the laundry care substance has completely dissolved in the wash liquor. Once the detected electric power value of the drain pump 1 17 matches the reference power value, the controller 127 may after

Termination of the second period of the liquor pump 1 17 continue operating in a subsequent third period of time and ensure effective delivery of wash liquor through the inlet port 1 1 1 in the tub 109. Through the power detection element 137 and through the controller 127, different dissolution speeds can be detected when using different laundry substances, and thus it can be accurately determined when the pumping operation can be started, without being left unresolved

Waschepflegesubstanz comes into contact with the laundry in the washing drum 107. When the laundry-care substance has been advantageously dissolved in the wash liquor, the wash liquor may be upgraded by a simple pump power increase, e.g. Speed increase of the drain pump 1 17, are fed through the inlet port 1 1 1 in the tub 109 and the laundry are moistened with the wash liquor. It may also be advantageous, when flushing the Wäschepflegesubstanz from the dispenser 101 into the tub 109 to operate the lye pump 1 17 already with a low pumping power to ensure that a blockage of the discharge port 1 13 is prevented in an overdose of Wäschepflegesubstanz by the user ,

By the reciprocal pumping, or back conveying the drain pump 1 17 by the controller 127 during the first and second time period, an advantageous resolution of the laundry care substance is achieved in the wash liquor. Thus, damage to the laundry can be avoided by undissolved Wäschepflegesubstanz with improper dosage of Wäschepflegesubstanz.

3 shows a sequence of a method 200 for maintaining laundry in one

Umpumpsystem 105 of a laundry care device 100, which is described in accordance with FIG. 2.

The method comprises, as a first method step, the activation 201 of a

Delivery operation of the drain pump 1 17 in a first period by the controller 127 to pump wash liquor through the discharge port 1 13 from the tub 109 into the line 1 15 to a wash liquor level 131 in the line 1 15.

The method comprises, as a second method step, setting 203 of

Delivery operation of the drain pump 1 17 in a at the first time period subsequent second period of time to carry the wash liquor from the line 1 15 through the discharge port 1 13 back into the tub 109.

All of the features explained and shown in connection with individual embodiments of the invention may be provided in different combinations in the article according to the invention in order to simultaneously realize their advantageous effects.

The scope of the present invention is given by the claims and is not limited by the features illustrated in the specification or shown in the figures.

LIST OF REFERENCE NUMBERS

100 laundry care device

101 induction bowl

103 door

105 pumping system

107 washing drum

109 tubs

1 1 1 inlet opening

1 13 drain opening

1 15 line

1 17 drain pump

1 19 First line section

121 Second line section

123 filling line

125 First tank level

127 control

129 control connection

131 wash liquor level

133 Second tank level

135 Further wash liquor level

137 Performance detection element

139 detection connection

200 Procedures for Maintaining Laundry

201 First process step: Activate a conveying operation of the drain pump

203 Second process step: Setting the delivery mode of the drain pump

Claims

1 . A laundry care appliance (100) having a suds container (109) for receiving suds, wherein the suds container (109) comprises a discharge opening (1 13) and an inlet opening (1 1 1), wherein the discharge opening (1 13) below the

Inlet opening (1 1 1) arranged and with the inlet opening (1 1 1) through a line (1 15) is connected, wherein in the conduit (1 15) a drain pump (1 17) is arranged, and a controller (127) for Controlling the drain pump (1 17), thereby

marked that

the controller (127) is formed in a first period of time

Activate the conveying operation of the drainage pump (1 17) in order to draw washing liquor through the

Drain port (1 13) from the tub (109) in the line (1 15) pump to a wash liquor level (131) in the line (1 15), and that

the controller (127) is designed to adjust the delivery mode of the drain pump (1 17) in a second time section adjoining the first time section in order to return the wash liquor from the line (1 15) through the discharge opening (1 13) back into the tub (15). 109).

2. laundry care device (100) according to claim 1, characterized in that the inlet opening (1 1 1) on the tub (109) is arranged at an inlet height, that the discharge opening (1 13) to the tub (109) arranged at a discharge height with the wash liquor level (131) in the conduit (15) between the inlet level and the drain level.

3. laundry care device (100) according to claim 1 or 2, characterized in that the wash liquor after completion of the second time period another

Wash liquor level (135) in the conduit (1 15), wherein the further

Wash liquor level (135) is less than the wash liquor level (131), and wherein the further wash liquor level (135) corresponds in particular to the drain level.

4. laundry care device (100) according to any one of the preceding claims, characterized in that the controller (127) is adapted to deactivate the drain pump (1 17) in the second period.

5. laundry care device (100) according to one of claims 1 to 3, characterized

characterized in that the controller (127) is adapted to activate in the second period of time a further conveying operation of the drain pump (1 17) in order to return the wash liquor from the conduit (1 15) through the discharge opening (1 13) back into the tub (109 ) to transport.

6. laundry care device (100) according to any one of the preceding claims, characterized in that the controller (127) is adapted to repeat after the second time period, the first time period and the subsequent to the first time period second time period.

7. The laundry care device (100) according to any one of the preceding claims, characterized in that the laundry care device (100) comprises a power detection element (137) for detecting an electric power value of the drain pump (1 17), wherein the controller (127) is formed, the detected to compare the electric power value of the drain pump (1 17) with a reference power value of the drain pump (1 17), and wherein the controller (127) is adapted to activate the drain pump (1 17) during a third time period subsequent to the second period To pump wash liquor through the drain opening (1 13) from the tub (109) and to transport the wash liquor through the inlet opening (1 1 1) in the tub (109) when the detected electrical power value with the

Reference power value coincides.

8. laundry care apparatus (100) according to claim 7, characterized in that the power detecting element (137) comprises a current sensor for detecting a

Supply current of the drain pump (1 17).

9. laundry care device (100) according to claim 7 or 8, characterized in that the controller (127) is adapted to operate the drain pump (1 17) during the first time period with a first pumping power and during the third time period with a further pumping power, wherein the further pumping power is higher than the first pumping power.

10. The laundry care device (100) according to any one of the preceding claims, characterized in that the laundry care device (100) comprises a level sensor for detecting a level of wash liquor in the conduit (1 15), wherein the controller (127) is formed, the first time period as soon as the detected level of wash liquor corresponds to the wash liquor level (131).

1 1. Laundry care appliance (100) according to one of the preceding claims, characterized in that the wash liquor in the tub (109) at the beginning of the first time period, a first container level (125), wherein the first

Container level (125) in the tub (109) is at a first container level, that the wash liquor in the tub (109) after completion of the first time period, a second container level (133), wherein the second container level (133) in the tub (109 ) is in a second container height, and wherein the second

Container height is less than the first container height.

12. laundry care device (100) according to claim 1 1, characterized in that the

Washing liquor after completion of the second period another

Wash liquor level (135) in the conduit (1 15), wherein the further

Wash liquor level (135) is less than the wash liquor level (131), and wherein the further wash liquor level (135) in the conduit (15) corresponds to the second vessel height.

13. laundry care device (100) according to any one of the preceding claims, characterized in that the drain pump (1 17) has a pressure side and a suction side, wherein the wash liquor during the first period from the suction side to the pressure side of the drain pump (1 17) through the Line (1 15) is pumped, and wherein the wash liquor during the second period from the pressure side to the suction side of the drain pump (1 17) through the conduit (1 15) is transported back.

14. laundry care device (100) according to any one of the preceding claims, characterized in that the line (1 15) has a first line section (1 19) between the discharge opening (1 13) and the drain pump (1 17) and a second

Line section (121) between the drain pump (1 17) and the inlet opening (1 1 1) wherein the first line section (1 19) has a different diameter than the second line section (121).

15. Method (200) for maintaining laundry in a laundry care appliance (100) with a suds container (109) for receiving suds, wherein the suds container (109) comprises a discharge opening (1 13) and an inlet opening (1 1 1) the

Discharge opening (1 13) below the inlet opening (1 1 1) and arranged with the

Inlet opening (1 1 1) through a line (1 15) is connected, wherein in the conduit (1 15) a drain pump (1 17) is arranged, and with a controller (127) for controlling the drain pump (1 17), characterized characterized in that the method (200)

activating (201) a delivery operation of the drain pump (1 17) in a first

Period of time through the controller (127) to pump wash liquor through the drain port (1 13) from the tub (109) into the duct (1 15) to a scrub liquor level (131) in the duct (1 15), and

adjusting (203) the conveyance operation of the suds pump (1 17) in a second period subsequent to the first period to convey the suds from the conduit (1 15) back to the suds container (109) through the discharge opening (1 13) , includes.