DE102015214804B3 - Laundry care device with a drain pump - Google Patents

Abstract

The present invention relates to a laundry care apparatus (100) comprising a suds container (109) for holding suds, a heating element (112) for heating the suds, a drain opening (113) arranged on the suds container (109) for discharging suds, the drain opening (113) connected to a drain hose (115) and closable by a closure (114), wherein the drain hose (115) is connected to a drain pump (121), and with a controller (129) for controlling the drain pump (121). The controller (129) is adapted to activate in a first period of time a conveying operation of the drain pump (121) to convey wash liquor through the drain opening (113) from the tub (109) into the drain hose (115). The controller (129) is adapted, in a second period subsequent to the first period of time, to adjust the delivery operation of the drain pump (121) with drain port (113) closed by the shutter (114) to receive the pumped wash liquor in the drain hose (115) to release a biofilm from the drain hose (115). The controller (129) is configured to activate the drain pump (121) for pumping out the wash liquor and the dissolved biofilm from the drain hose (115) in a third time period subsequent to the second time interval in order to clean the drain hose (115).

Description

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

After completion of the laundry care process residual water remains in a drain hose of conventional laundry care equipment. If the laundry machine is then not operated for an extended period of time, a biofilm and unpleasant odors may develop in the drain hose of the laundry machine, the unpleasant odors, under unfavorable conditions, penetrating the exterior of the laundry machine and being perceived by the user of the laundry machine.

In DE 10 2014 214 351 A1 shown a household appliance with a pumping system comprising a first line, a second line, a tub and a lye storage, wherein the first and second line connects the tub to the liquor storage. The pumping system includes a pump for pumping wash liquor to remove a biofilm on an inner surface of the first and second conduits, the tub and the liquor storage.

In DE 10 2012 223 682 A1 a water-conducting household appliance is shown with a treatment container for receiving objects to be treated, at least one inner surface and in particular a water supply line, wherein the inner surface has a coating with a switchable polymer.

document DE 10 2010 042 038 A1 shows a laundry treatment machine containing a tub for receiving the wash liquor or the rinse water, which has a drain opening at the lowest point and a drain pipe for connection to a Flüssigkeitsabpumpsystem consisting of a liquid pump with a connected on the pressure side up discharge hose, a drain hose on the Suction side of the pump and a closing device integrated in the drain hose, which prevents that after switching off the pump, the back-flowing liquid gets back into the tub.

It is the object of the present invention to provide a laundry care device in which an advantageous cleaning of the drain hose 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 device having a suds container for holding suds, a heating element for heating the suds, an outlet opening arranged on the suds container for discharging suds, the outlet opening being connected to a drainage tube and being closable by a closure, the drain hose being connected to a drain pump and having a control for controlling the drain pump, the control being configured to activate a carry operation of the drain pump in a first period to convey wash liquor from the wash tub to the drain hose through the drain opening; wherein the controller is designed to adjust the delivery mode of the drain pump in a second time period adjoining the first time section when the drain opening is closed by the closure in order to supply the pumped-off wash liquor in the drainage hose in order to release a biofilm from the drain hose, and wherein the controller is configured to activate, in a third time period subsequent to the second time period, the drain pump for draining the wash liquor and dissolved biofilm from the drain hose to clean the drain hose.

Thereby, the technical advantage is achieved that the pumped-off wash liquor in the second period of time can effectively detach the biofilm from the drain hose, and that the wash liquor and the dissolved biofilm can be pumped out of the drain hose in the third time period to clean the drain hose.

At a longer standstill of the laundry care device of the drain hose tends to intense biofilm formation, since residual water from previous laundry care operations in the drain hose stops. As a result, a biofilm, as well as unpleasant odors arise, the unpleasant odors can escape from the laundry care device and can be perceived by the user. In a leaky closure of the drain opening of the tub, z. B. by foreign bodies or a damaged seal may biofilm-containing residual water may penetrate through the drain opening in the tub and there lead to a germ load of the laundry to be cleaned, or to an unpleasant odor of the laundry to be cleaned. If the user wants to drain residual water from the drain hose, or wants to remove a foreign body from the drain hose, the user comes directly into the drain hose existing residual water or biofilm in contact.

In the present invention, a removal or reduction of biofilms in the drain hose of a laundry care device is achieved by treating the drain hose with warm wash liquor for a certain period of time, the wash liquor in particular having a temperature of more than 40 ° C. As a result, detachment of the biofilm from the drainage tube can be achieved, and the detached biofilm can subsequently be removed from the drainage tube by an intensive overflow with wash liquor in order to thereby clean the drainage tube.

During a laundry care process, a heated wash liquor is present in the tub through a heating element. During the first period of time, especially before the main wash cycle is completed, the controller activates a carry operation of the wash pump, whereby wash liquor is conveyed from the wash tub into the drain hose through the drain opening. The wash liquor is conveyed only into the drain hose and not pumped through the drain hose from the laundry care device, so that the wash liquor level does not drop too much in the tub.

In the second period of time adjoining the first period, the controller adjusts the delivery mode of the drain pump. This results in a pressure drop in the drain hose and the pumped wash liquor flows back into the drain hose. Since the shutter in the second period closes the drain opening, the wash liquor flowing back in the drain hose can not penetrate through the drain opening into the tub, whereby the wash liquor is received in the drain hose. In particular, the closure may comprise a buoyant body disposed at the drain opening, which in the second period is forced by the wash liquor flowing back into the drain hose against a seal at the drain opening of the tub, thereby achieving a liquid-tight closure of the drain opening.

In the second period of time, the wash liquor remains in the drain hose, whereby the wash liquor can act on the biofilm and thereby release the biofilm from the drain hose. Subsequently, in a subsequent to the second period third period of time, the drain pump is activated again to drain the absorbed in the drain hose and the detached biofilm from the drain hose, whereby an effective cleaning of the drain hose is achieved. The pumping out of the wash liquor and the detached biofilm during the third time period represents a common process, which takes place in particular at the end of the main wash cycle.

Under a laundry care device is understood a device which is used for laundry care, such. B. a washing machine or a washer-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 appliance, the laundry care appliance comprises a washing drum for receiving laundry, the laundry care appliance comprises a drive for rotating the washing drum, and the controller is designed to deactivate the drive before the start of the first time period in order to stop a rotation of the washing drum.

Thereby, the technical advantage is achieved that by stopping the rotation of the washing drum, the wash liquor is collected in the tub before the beginning of the first period, whereby no exchange of the wash liquor can take place with the recorded in the washing drum laundry. Particularly in a low-temperature washing program in which the temperature of the wash liquor in the tub is, in particular, less than 40 ° C, the collected wash liquor can then be effectively heated to convey the heated wash liquor into the drain hose in the first time period.

In a further advantageous embodiment of the laundry care device, the tub has a drainage area for receiving wash liquor, the heating element is disposed in the drain area, and the controller is configured to activate the heating element before the beginning of the first time period to heat the wash liquor in the drain area ,

Thereby, the technical advantage is achieved that is obtained by the heating of the wash liquor in the drainage area by the heating element advantageously heated wash liquor through which an effective detachment of biofilm can be ensured by the drain hose. By the heating element ensures that even in a laundry care process with a non-heated wash liquor such. B. during a fine wash program or a cold wash program, a sufficient heating of the wash liquor is ensured to effectively clean the drain hose with the heated wash liquor.

In a further advantageous embodiment of the laundry care appliance, the laundry care appliance comprises a water supply device for feeding water into the suds container, and the controller is designed to activate the water supply device in the second time segment in order to supply water to the suds container.

As a result, the technical advantage is achieved that by supplying water through the water supply device during the second time period damage to optionally temperature-sensitive laundry in the washing drum can be prevented. After heated wash liquor was pumped out of the tub in the drain hose through the drain pump during the first time period, the heated wash liquor in the tub can be cooled by the addition of cool fresh water through the water supply means during the second time period.

In a further advantageous embodiment of the laundry care appliance, the drainage opening comprises a seal, wherein the seal is designed to seal the drainage opening closed by the closure in a liquid-tight manner.

As a result, the technical advantage is achieved that a liquid-tight closure of the drain opening is made possible by the seal through the seal, whereby no liquid can escape through the closed drain opening.

In a further advantageous embodiment of the laundry care apparatus, the closure comprises a buoyant body, which is designed to close the drain opening in the second time period in a set conveying operation of the drain pump.

As a result, the technical advantage is achieved that an efficient, liquid-tight closure of the drain opening is made possible by the buoyant body. In the second period, the suds pump stops the siphon conveying operation, whereby the suds flowing in the siphon hose flow back to a small extent, causing the buoyant body to float on the recirculating suds and be positioned at the drainage opening to effectively close the drainage opening.

In a further advantageous embodiment of the laundry care appliance, the drain hose has an inlet section and a drainage section, wherein the drainage opening is connected to the inlet section, wherein the drainage pump is connected to the inlet section and the drainage section of the drainage tube, and wherein the drainage section is provided with an outlet opening on an outside the laundry care device is connected.

As a result, the technical advantage is achieved that an effective pumping out of wash liquor from the tub and an effective removal of biofilm from the drain hose can be ensured by connecting the drain pump with the inlet section and the pumping section of the drain hose. Wash liquor pumped out of the tub is pumped out of the laundry care appliance through the drain opening, through the inlet section of the drain hose, through the drain pump, through the drainage section of the drain hose and through the outlet opening.

In a further advantageous embodiment of the laundry care appliance, the drainage opening is arranged on the tub at a drainage height, and the outlet opening is arranged on the outside of the laundry care appliance at an outlet height, wherein the wash liquor after the first time period has a liquid column in the drainage hose, and wherein the liquid column between the drainage height and the outlet height.

As a result, the technical advantage is achieved that sufficient wetting of the biofilm in the drainage tube with wash liquor is achieved by the promotion of the wash liquor in the first period up to the liquid column in the drain hose. The liquid column in the drain hose lies between the drainage height and the outlet height after the first period of time. The fact that the liquid column is above the drainage height ensures that the wash liquor wets a sufficient area of the drainage hose. The fact that the liquid column is below the outlet height ensures that the wash liquor is not pumped out of the laundry care appliance through the outlet opening during the first period of time.

In a further advantageous embodiment of the laundry care appliance, the pumping down section of the drainage hose has an opening for venting the drainage hose.

As a result, the technical advantage is achieved that an advantageous pressure equalization is ensured in the drain hose through the opening for venting the drain hose. If in the second period of the delivery operation of the drain pump is adjusted, allows an advantageous pressure equalization effective back flow of the pumped wash liquor in the drain hose to the closed by the closure drain opening.

In a further advantageous embodiment of the laundry care appliance, the wash liquor after completion of the second time period, a further liquid column in the drain hose, wherein the further liquid column has a lower height than the liquid column.

As a result, the technical advantage is achieved that an effective release of the biofilm from the drain hose is achieved by the inclusion of the wash liquor in the drain hose. If in the second period of the delivery operation of the drain pump is adjusted, the pumped wash liquor flows in the drain hose back to the closed by the closure drain opening. This results in a small drop in the column of the wash liquor in the drain hose, so that the wash liquor in the drain hose has a further liquid column, which has a low height than the liquid column.

In a further advantageous embodiment of the laundry care device, the controller is designed to deactivate the drain pump in the second period of time.

Thereby, the technical advantage is achieved that the backflow of the wash liquor in the drain hose is not carried out by an active pumping operation of the drain pump, but by a backflow of the wash liquor due to the hydrostatic pressure of the wash liquor in the drain hose. 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 a further advantageous embodiment of the laundry care appliance, the laundry care appliance comprises a liquid sensor for detecting a column of wash liquor in the drainage tube, wherein the controller is designed to end the first time period as soon as the detected column of wash liquor corresponds to the liquid column.

As a result, the technical advantage is achieved that an automatic transition from the first time period to the second time period is ensured by the liquid sensor. The controller can determine from the detected column of wash liquor as soon as the suds pumped into the drain hose has reached the liquid column and can then stop the pump down process. As a result, it can be prevented that the drain pump pumps the wash liquor pumped out during the first time section beyond the liquid column out of the laundry care appliance.

In a further advantageous embodiment of the laundry care appliance, the laundry care appliance comprises a temperature sensor for detecting a temperature of the wash liquor in the tub, wherein the controller is designed to activate the conveying operation of the liquor pump in the first time period when the detected temperature reaches a temperature threshold.

Thereby, the technical advantage is achieved, that ensures that the drain pump in the first period of washing liquor pumped out of the tub only when the temperature detected by the temperature sensor corresponds to a predetermined temperature threshold. This will ensure that the pumped-off wash liquor has been heated sufficiently to ensure effective removal of biofilm in the drain hose.

In a further 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 drain hose from the suction side to the pressure side of the drain pump during the first time period, and the wash liquor is pumped from the pressure side during the second time period the suction side of the drain pump is transported back through the drain hose.

Thereby, the technical advantage is achieved that is ensured by the arrangement of the drain pump in the drain hose effective pumping of wash liquor from the tub into the drain hose during the first period and an effective absorption of the wash liquor in the drain hose during the second period.

According to a second aspect of the invention, the object is achieved by a method for releasing a biofilm in a drain hose of a laundry care device, wherein the laundry care device a tub for receiving wash liquor, a heating element for heating the wash liquor, arranged on the tub outlet opening for discharging wash liquor wherein the drain opening is connected to a drain hose and closable by a closure, the drain hose being connected to a drain pump, and having a controller for controlling the drain pump, the method comprising activating a carry operation of the drain pump in a first time period by the controller to convey washing liquor through the drainage opening from the tub into the drainage hose, adjusting the delivery operation of the drain pump in a second time period adjoining the first time period to remove the pumped wash liquor in the drain To accommodate a biofilm of the drain hose, and activating the drain pump for pumping the Wash liquor and the dissolved biofilm from the drain hose in a subsequent to the second period of time third period of time by the controller to clean the drain hose comprises.

This achieves the technical advantage that the advantageous removal of biofilm from the drain hose is ensured by the sequence of activation of the drain pump, setting of the delivery mode of the drain pump and the renewed activation of the drain pump and the correlated pumping, or the return of wash liquor. whereby an effective cleaning of the drain hose is achieved. The method can in particular be carried out shortly before the end of the main wash cycle of a laundry care program of the laundry care device, whereby the advantage is achieved that the residual washing power of the wash liquor due to overdosage of detergent ensures the wash liquor heated during the main wash cycle advantageously removing the biofilm.

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

1 a schematic view of a laundry care device;

2 a schematic view of a laundry care device with a drain hose connected to a drain pump; and

3 a sequence of a method for releasing a biofilm in a drain hose of a laundry care device.

1 shows a schematic view of a general laundry care device 100 , such as B. a washing machine. The laundry care device 100 includes an induction bowl 101 , in the washing care substance, such as. As detergent, can be filled. The laundry care device 100 includes a door 103 for loading the laundry care device 100 with laundry and includes a device housing 105 ,

2 shows a schematic view of a laundry care device with a drain hose. The laundry care device 100 includes a device housing 105 , one in the device housing 105 arranged washing drum 107 for holding laundry and a tub 109 for the absorption of washing liquor. The tub 109 has a drain area 111 in which the wash liquor in the tub 109 is recorded. In the drain area 111 is a heating element 112 arranged, which is formed in the drainage area 111 to heat absorbed wash liquor.

The tub 109 has a drain opening 113 on which at a bottom of the tub 109 is arranged. The drain opening 113 is through a lock 114 closable. The drain opening 113 is with a drain hose 115 connected, wherein the drain hose 115 an inlet section 117 and a pump-down section 119 having. The drain opening 113 is with the inlet section 117 the drain hose 115 connected. Between the inlet section 117 and a pumping section 119 the drain hose 115 is a drain pump 121 seconded. The pumping section 119 is with an outlet opening 123 on the device housing 105 connected. The drain pump 121 is formed, wash liquor through the drain opening 113 from the tub 109 pump out and the pumped-off wash through the inlet section 117 , through the pumping section 119 and through the outlet opening 123 from the laundry care device 100 pump out. The laundry care device 100 further comprises a water supply device 125 passing through a water supply line 127 with the tub 109 is connected to fresh water the tub 109 supply.

In conventional laundry care appliances 100 remains after a laundry care process residual water in the drain hose 115 , which can form a biofilm and unpleasant odors. The unpleasant odors can under unfavorable circumstances from the laundry care device 100 escape and be perceived by the user. In order to remove a biofilm, the area covered with a biofilm must come in contact for a suitable time with warm washing liquor, which in particular has a temperature of more than 40 ° C. Subsequently, the biofilm can be removed by an intensive overflow with washing liquor.

Before the end of the washing process, for example 10 minutes before the end, activates a control 129 of the laundry care device 100 , which through a control connection 131 with the drain pump 121 is connected, in a first period of time, the drain pump 121 , The drain pump 121 Pumps washing solution out of the tub 109 through the drain hole 113 in the drain hose 115 , where the controller 129 the drain pump 121 however, such controls that the pumped-off wash liquor does not pass through the outlet port 123 from the laundry care device 100 Will get removed. Instead, pressure builds up from the drain pump 121 a column of wash liquor in the pumpdown section 119 the drain hose 115 on, wherein the column of wash liquor after the first time gating a liquid column 133 in the pumping section 119 reached, and where the height of the liquid column 133 below the height of outlet 123 lies. This can ensure that the wash liquor level in the tub 109 does not sink too much, whereby the remaining washing time is maintained.

In a subsequent to the first period second period of time, the controller provides 129 the conveying operation of the drain pump 121 one, causing the in the drain hose 115 existing liquid column 133 sinks and whereby by the back-flowing wash the closure 114 the drain opening 113 is closed. The closure 114 in particular comprises a buoyant body which the drain opening 113 closes, causing the wash liquor in the drain hose 115 is absorbed and thereby biofilm of the drain hose 115 can solve.

In a subsequent to the second period third period activates the controller 129 again the drain pump 121 to wash and dissolved biofilm from the drain hose 115 pump down to the drain hose 115 to clean.

For low-temperature washing programs, especially at a temperature of less than 40 ° C, the washing drum may rotate shortly before the end of the main wash cycle 107 be stopped, causing no replacement in the drain area 111 of the tub 109 freely available wash liquor with the laundry can take place more. Subsequently, the freely available wash liquor in the drain area 111 of the tub 109 heated to a temperature of more than 40 ° C, without the laundry to heat up. Subsequently, the drain pump 121 in the first period of washing liquor through the drain opening 113 from the tub 109 in the drain hose 115 transport. For sensitive textiles, such as. B. wool or silk is during the second period to avoid temperature-induced textile damage something cold fresh water in the tub 109 filled.

An essential advantage of the invention lies in the frequent treatment of the drain hose 115 against biofilm and / or bad smells. In every washing process, in which a temperature of more than 40 ° C is reached in particular, the drain hose 115 sanitized. Since heavy-duty detergents are frequently used at higher washing temperatures, for example, in the case of powder detergents, it is also possible for bleaching agents to be present in the wash liquor in addition to the detergent-active substances. As a result, a further cleaning effect is achieved and a hygienic treatment of the laundry is made possible. An advantage of the present invention is that by the user of the laundry care device 100 no additional cleaner must be added, or no additional cleaning step must be initiated. The dissolved biofilm and the odor-contaminated wastewater are directed at a fixed wastewater connection directly into the drain. Additionally formed deposits, such. As sand, lint, fats or waxes, which are due to the biofilm, or together with the biofilm, fixed, are removed together with the detached biofilm, creating the risk of clogging of the drain hose 115 , or the drain pump 121 , is reduced.

3 shows a sequence of a method for releasing a biofilm in a drain hose of a laundry care device.

The procedure 200 comprises activation as the first method step 201 a conveying operation of the drain pump 121 in a first period of time by the controller 129 to wash liquor through the drain opening 113 from the tub 109 in the drain hose 115 to transport. The method comprises setting as the second method step 203 the conveying operation of the drain pump 121 in a subsequent to the first period of time second period of time, the pumped out wash liquor in the drain hose 115 take. The method comprises activating as a third method step 205 the drain pump 121 in a subsequent to the second period third period of time by the controller 129 to wash lye and the dissolved biofilm from the drain hose 115 pump down to the drain hose 115 to clean.

LIST OF REFERENCE NUMBERS

100

Laundry care device

101

dispenser tray

103

door

105

device housing

107

washing drum

109

tub

111

drainage area

112

heating element

113

drain hole

114

shutter

115

drain hose

117

inlet section

119

Abpumpabschnitt

121

Drain pump

123

outlet

125

Water supply means

127

Water supply line

129

control

131

control connection

133

liquid column

200

A method for releasing a biofilm in a drain hose of a laundry care device

201

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

203

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

205

Third step: Activate the drain pump

Claims (15)

Laundry care device ( 100 ) with a tub ( 109 ) for receiving washing liquor, a heating element ( 112 ) for heating the wash liquor, one at the tub ( 109 ) arranged drain opening ( 113 ) for discharging washing liquor, wherein the drain opening ( 113 ) with a drain hose ( 115 ) and by a closure ( 114 ) is closable, wherein the drain hose ( 115 ) with a drain pump ( 121 ) and with a controller ( 129 ) for controlling the drain pump ( 121 ), characterized in that the controller ( 129 ) is formed, in a first period of time a conveying operation of the drain pump ( 121 ) to allow suds to flow through the drain ( 113 ) from the tub ( 109 ) in the drain hose ( 115 ) that the controller ( 129 ) is formed, in a subsequent to the first period second period of time the conveying operation of the drain pump ( 121 ) through the closure ( 114 ) closed drain opening ( 113 ) to adjust the pumped-off wash liquor in the drain hose ( 115 ) to collect a biofilm from the drain hose ( 115 ) and that the controller ( 129 ) is formed, in a subsequent to the second period third period of time the drain pump ( 121 ) for pumping out the wash liquor and the dissolved biofilm from the drain hose ( 115 ) to activate the drain hose ( 115 ) to clean. Laundry care device ( 100 ) according to claim 1, characterized in that the laundry care device ( 100 ) a washing drum ( 107 ) for receiving laundry, that the laundry care device ( 100 ) a drive for rotating the washing drum ( 107 ) and that the controller ( 129 ) is adapted to deactivate the drive before the beginning of the first time period in order to prevent a rotation of the washing drum ( 107 ) to stop. Laundry care device ( 100 ) according to claim 1 or 2, characterized in that the tub ( 109 ) a drain area ( 111 ) for receiving washing liquor, that the heating element ( 112 ) in the drain area ( 111 ) and that the controller ( 129 ) is formed, the heating element ( 112 ) before the beginning of the first period of time in order to keep the wash liquor in the drainage area ( 111 ) to heat. Laundry care device ( 100 ) according to one of the preceding claims, characterized in that the laundry care appliance ( 100 ) a water supply device ( 125 ) for supplying water into the tub ( 109 ) and that the controller ( 129 ), in the second period of time the water supply device ( 125 ) to add water to the tub ( 109 ). Laundry care device ( 100 ) according to one of the preceding claims, characterized in that the drain opening ( 113 ) comprises a seal, wherein the seal is formed by the closure ( 114 ) closed drain opening ( 113 ) to close liquid-tight. Laundry care device ( 100 ) according to one of the preceding claims, characterized in that the closure ( 114 ) comprises a buoyant body, which is formed, the drain opening ( 113 ) in the second time period at a set conveying operation of the drain pump ( 121 ) to close. Laundry care device ( 100 ) according to one of the preceding claims, characterized in that the drain hose ( 115 ) an inlet section ( 117 ) and a pumping section ( 119 ), wherein the drain opening ( 113 ) with the inlet section ( 117 ), wherein the drain pump ( 121 ) with the inlet section ( 117 ) and the pumping section ( 119 ) of the drain hose ( 115 ) and the pumping section ( 119 ) with an outlet opening ( 123 ) on an outside of the laundry care device ( 100 ) connected is. Laundry care device ( 100 ) according to claim 7, characterized in that the drain opening ( 113 ) on the tub ( 109 ) is arranged in a drainage height, and that the outlet opening ( 123 ) on the outside of the laundry care device ( 100 ) is arranged at an outlet height, wherein the wash liquor after the first time period, a liquid column ( 133 ) in the drain hose ( 115 ), and wherein the liquid column ( 133 ) is between the drainage height and the outlet height. Laundry care device ( 100 ) according to claim 7 or 8, characterized in that the pumping section ( 119 ) of the drain hose ( 115 ) an opening for venting the drain hose ( 115 ) having. Laundry care device ( 100 ) according to claim 8 or 9, characterized in that the wash liquor after completion of the second time period, a further liquid column in the drain hose ( 115 ), wherein the further liquid column has a lower height than the liquid column ( 133 ) having. Laundry care device ( 100 ) according to one of the preceding claims, characterized in that the controller ( 129 ), in the second time period the drain pump ( 121 ). Laundry care device ( 100 ) according to one of claims 8 to 11, characterized in that the laundry care device ( 100 ) a liquid sensor for detecting a column of wash liquor in the drain hose ( 115 ), wherein the controller ( 129 ) is adapted to terminate the first time period as soon as the detected column of wash liquor of the liquid column ( 133 ) corresponds. Laundry care device ( 100 ) according to one of the preceding claims, characterized in that the laundry care appliance ( 100 ) a temperature sensor for detecting a temperature of the wash liquor in the tub ( 109 ) and that the controller ( 129 ), the conveying operation of the drain pump ( 121 ) in the first period when the sensed temperature reaches a temperature threshold. Laundry care device ( 100 ) according to one of the preceding claims, characterized in that the drain pump ( 121 ) has a pressure side and a suction side, wherein the wash liquor during the first time period from the suction side to the pressure side of the drain pump ( 121 ) through the drain hose ( 115 ) and wherein the wash liquor during the second time period from the pressure side to the suction side of the drain pump ( 121 ) through the drain hose ( 115 ). Procedure ( 200 ) for releasing a biofilm in a drain hose ( 115 ) of a laundry care device ( 100 ), wherein the laundry care device ( 100 ) a tub ( 109 ) for receiving washing liquor, a heating element ( 112 ) for heating the wash liquor, one at the tub ( 109 ) arranged drain opening ( 113 ) for discharging washing liquor, wherein the drain opening ( 113 ) with a drain hose ( 115 ) and by a closure ( 114 ) is closable, wherein the drain hose ( 115 ) with a drain pump ( 121 ), and a controller ( 129 ) for controlling the drain pump ( 121 ), characterized in that the method ( 200 ) activating ( 201 ) of a conveying operation of the drain pump ( 121 ) in a first period of time by the controller ( 129 ) to wash liquor through the drainage opening ( 113 ) from the tub ( 109 ) in the drain hose ( 115 ), setting ( 203 ) of the conveying operation of the drain pump ( 121 ) in a second period of time adjoining the first period of time in order to remove the pumped-off wash liquor in the drain hose ( 115 ) to collect a biofilm from the drain hose ( 115 ) and activating ( 205 ) of the drain pump ( 121 ) for pumping out the wash liquor and the dissolved biofilm from the drain hose ( 115 ) in a third period of time adjoining the second period of time ( 129 ) to the drain hose ( 115 ).

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