EP3212835B1 - Laundry care appliance with a drain pump - Google Patents

Description

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

In order to be able to carry out an effective laundry care process, large-volume laundry care appliances nowadays have a pumping system, through which washing suds can be pumped out of the suds container and then fed back into the suds container. In order to remove suds from the laundry care appliance after the laundry care process, laundry care appliances nowadays also have a pump-out system. Pumps are required for the pump-over system and the pump-out system in order to ensure effective pump-over or pump-out of the wash suds.

In DE 32 09 542 C1 describes a clockwise and counterclockwise drivable radial centrifugal pump as a circulating pump in a dishwasher.

The utility model document CN 201 722 529 U shows a washing machine comprising a pumping system.

The patent specification US 3,257,950A discloses a laundry care appliance with a pump

The patent specification US 3,836,001A reveals a pump.

It is the object on which the invention is based to specify a laundry care appliance which is designed to carry out an effective laundry care process.

This problem is solved by objects with the features according to the independent claim. Advantageous embodiments of the invention are the subject matter of the figures, the description and the dependent claims.

According to a first aspect of the invention, the object is achieved by a laundry care appliance with a pumping system, the pumping system having a Suds container with an inlet opening and a drain opening, a line which connects the inlet opening and the drain opening, and a drain pump for pumping washing suds through the pump-around system, with a suction connection, with a pressure chamber, which has a pump-over connection and a pump-out connection, and with an impeller , wherein the drain pump is designed to pump the washing lye in a preferred direction of rotation of the impeller through the pump-over connection piece to the tub, and to pump out the washing suds through the pump-out connection piece in a pump-out direction of rotation of the impeller, the pump-out connection piece and the pump-over connection piece being tangential to the pressure chamber connect.

This achieves the technical advantage that, due to the preferred direction of rotation of the impeller of the drain pump, the washing suds are pumped out of the pumping system again through the pumping connection through the line to the tub, or the washing suds are pumped out of the laundry care appliance through the pumping out connection by the pumping-out direction of rotation of the impeller becomes. Depending on the selected direction of rotation of the impeller, the drain pump thus combines a pump-over function and a pump-out function in one component.

Conventional laundry care appliances with a pump-over system normally use drain pumps that are activated in a single phase and with a mains frequency and do not have a preferred direction of rotation and therefore do not have a pump-out function that is dependent on the direction of rotation.

During a pumping process of a laundry care appliance of the present invention, the impeller of the suds pump moves in a preferred direction of rotation, the preferred direction of rotation over time, in order to suck in washing suds from the pumping system through the suction nozzle. The sucked-in detergent is delivered to the pressure chamber of the detergent pump at increased pressure. The washing suds are moved in a circular motion in the pressure chamber and can be pumped out of the pressure chamber through the pump-over nozzle, which adjoins the pressure chamber tangentially. It is crucial here that the pump-over connection tangentially adjoins the pressure chamber in order to ensure that the circular movement of the washing suds in the pressure chamber continues tangentially in the pump-over connection in order to pump the washing suds out of the pressure chamber. Due to the precise tangential arrangement of the Circulation connection in relation to the direction of flow of the suds in the pressure chamber caused by the preferred direction of rotation of the impeller over time, an effective pumping out of the suds is achieved through the pumping connection without suds being pumped out through the pump-out connection.

During a pumping-out process, the impeller of the drain pump moves in a pumping-out direction of rotation, which is opposite to the preferred direction of rotation over time. As a result, the sucked-in wash liquor is moved in the pressure chamber in a rotational movement which is opposite to the rotational movement of the wash liquor in the pressure chamber in the preferred direction of rotation of the impeller over time. As a result, the washing suds can be pumped out of the pressure chamber in the direction of pumping rotation through the pump-out nozzle, which also adjoins the pressure chamber tangentially. Due to the precise tangential arrangement of the pump-out connection with respect to the direction of rotation of the pump-out, an effective pumping out of the washing suds through the pump-out connection is achieved without the washing lye being pumped around through the pump-over connection. A direction-dependent pumping or pumping-out function of the drain pump is thus implemented.

For this reason, the use of the drain pump with a pump-over and pump-out function enables simplification and cost reduction when used in laundry care devices, since only one motor with a hydraulic arrangement is used. In addition, the drain pump can replace existing drain pumps without changing mechanical interfaces or other elements of the pumping system, such as an inlet or outlet hose.

A laundry care device is understood to be a device that is used for laundry care, such as a washing machine or a washer-dryer. In particular, such a laundry care appliance is understood to mean a household laundry care appliance. In other words, a laundry care device that is used as part of housekeeping and is used to treat laundry in normal household quantities.

In an advantageous embodiment of the laundry care appliance, the pressure chamber has a pumping area with the pumping connection and a pumping-out area with the pump-out connection.

This achieves the technical advantage that the separation of the pumping area from the pumping area ensures an effective separation of the pumping paths in the different directions of rotation of the impeller. The separation of pump-over area and pump-out area can preferably be improved by using a partition wall between pump-over area and pump-out area. The partition wall creates a physical separation between the pumping area and the pumping-out area, so that in the case of opposite rotational movements of the washing suds in the pressure chamber, the movement of the washing suds in the pressure chamber after the pumping-around area or after the pumping-out area is blocked. This reduces the possibility that the wash suds cannot be pumped out of the pump-over area but through the pump-out connection during a pumping process, or that the wash suds are pumped through the pump-out connection rather than out of the pump-out area during a pump-out process.

In a further advantageous embodiment of the laundry care appliance, a dividing wall is arranged between the pumping-around area and the pumping-out area, the dividing wall having a web for separating the pumping-out area and the pumping-out area.

This achieves the technical advantage that the use of the web of the dividing wall achieves a particularly effective separation of the pump-out area and the pump-over area.

According to the invention, the pump-out connection or pump-over connection is inclined at a first angle, in particular at an angle of less than 30°, relative to the vertical axis of the drain pump, or the suction connection is inclined at a second angle, in particular at an angle of , relative to the vertical axis of the drain pump less than 90° inclined.

This achieves the technical advantage that the different inclinations of pump-out connection, pump-over connection or suction connection relative to the vertical axis of the drain pump, the air of the suds-air mixture produced when the washing suds are drawn in through the suction connection effectively flows through the Pump-out nozzle or pump-over nozzle can be discharged. The vertical axis of the drain pump is arranged perpendicular to the horizontal axis of the drain pump and runs centrally between the pump-out connection and pump-over connection of the drain pump. The horizontal axis of the drain pump runs approximately parallel to the suction port. Due to the advantageous arrangement of the pump-out connection, pump-over connection or suction connection in relation to the vertical axis of the drain pump, a potentially occurring two-phase mixture of washing suds and air can be effectively pumped out either through the pump-out connection or through the pump-over connection, resulting in an effective pump-out or pump-over process achieved can be ensured.

In a further advantageous embodiment of the laundry care appliance, the pump-out connection piece has a first diameter and the pump-out connection piece has a second diameter, the first diameter being larger than the second diameter.

This achieves the technical advantage that due to the larger diameter of the pump-out connection compared to the pump-over connection, a larger quantity of washing suds can be pumped out through the pump-out connection than through the pump-over connection at a constant pumping capacity of the drain pump in a certain time interval. As a result, the pumping process can be designed to be advantageous in terms of time, so that rapid pumping out of the wash suds from the pump-over system is made possible.

In a further advantageous embodiment of the laundry care appliance, the impeller has a plurality of impeller blades, the impeller blades being curved.

This achieves the technical advantage that the curvature of the impeller blades enables fine-tuning of the impeller blade geometry in order to ensure a particularly advantageous flow movement of the washing liquor in the pressure chamber, in particular to ensure different delivery quantities of washing liquor depending on the direction of rotation of the impeller either through the pump-over connection or to pump through the pump out nozzle. The curved impeller blades can, for example, be designed in such a way that they preferentially convey the washing liquor in the preferred direction of rotation of the impeller to the pump-over connection piece of the pressure chamber conveyed to allow efficient pumping over of the wash liquor in the pumping system. The curved impeller blades can, for example, be designed in such a way that they preferentially transport the washing suds in the pumping-out direction of rotation of the impeller to the pump-out nozzle of the pressure chamber in order to ensure that the washing suds are pumped out effectively from the pump-over system.

In a further advantageous embodiment of the laundry care appliance, the laundry care appliance comprises a power acquisition element for acquiring an electrical power value of the drain pump, e.g to determine detected electrical power value of the drain pump, and wherein the controller is designed to control the speed of the impeller depending on the determined flow rate of washing suds.

This achieves the technical advantage that the pump performance-dependent determination of the flow rate enables simple and reliable control of the pump performance of the drain pump as a function of the flow rate, without an additional component for detecting the flow rate having to be introduced into the pumping system of the laundry care appliance. The power detection element can determine a reduction in the flow rate on the basis of a falling detected electrical power value of the drain pump, as a result of which the controller can correspondingly control the speed of the impeller of the drain pump.

In a further advantageous embodiment of the laundry care appliance, the power detection element comprises a current sensor for detecting a supply current of the drain pump.

This achieves the technical advantage that by using the current sensor, the drain pump can be effectively controlled without having to install a further sensor element in the laundry care appliance. The current sensor includes a switching resistor that detects the supply current of the drain pump during a time interval. The supply current of the drain pump depends on the Amount of suds pumped by the suds pump. If the amount of liquid delivered by the pump decreases, there will be a reduction in the flow rate supplied to the pump.

In a further advantageous embodiment of the laundry care appliance, the laundry care appliance comprises a flow sensor for detecting a flow rate of washing suds in the circulation pump system and a controller, wherein the controller is designed to compare the flow rate detected by the flow sensor with the flow rate determined by the detected electrical power value of the suds pump , in order to obtain a comparative value, and wherein the controller is designed to control the rotational speed of the impeller as a function of the comparative value obtained.

This achieves the technical advantage that, by comparing the flow rate determined by the flow sensor with the flow rate recorded using the electrical power value of the drain pump, the flow rate of the wash suds in the circulation pump can be precisely determined. As a result, an effective flow rate-dependent control of the speed of the impeller of the drain pump can be implemented.

In a further advantageous embodiment of the laundry care appliance, the laundry care appliance has a reservoir for storing washing suds, with the pump-out nozzle being connected to a reservoir via a pump-out line.

This achieves the technical advantage that by using the reservoir, which is connected to the pump-out connection via the pump-out line, the washing suds pumped out through the pump-out connection during the pumping process are not removed from the laundry care appliance and discarded, but are stored in the storage container. The washing suds stored in the reservoir can be reused during a subsequent wash cycle and can be fed back to the pumping system from the reservoir. The water and detergent consumption of the laundry care appliance can be effectively reduced by reusing the stored detergent solution.

In a further advantageous embodiment of the laundry care appliance, the drain pump has a first screen or a first nozzle on the pump-out connection piece and/or a second screen or a second nozzle on the pump-out connection piece.

This achieves the technical advantage that the use of baffles or nozzles on the pump-out connection or on the pump-over connection reduces the pressure of the washing liquor pumped out through the corresponding connection. Since there is an additional pressure loss at the orifice, the pressure reduction at the pump-out connection or at the pump-over connection can be used to design the drain pump to pump out washing suds from the pressure chamber either through the pump-out connection or through the pump-over connection, depending on the direction of rotation of the impeller of the drain pump .

In a further advantageous embodiment of the laundry care appliance, the first screen or the first nozzle on the pump-out connection has a third diameter, and the second screen or the second nozzle on the pump-over connection has a fourth diameter, the third diameter being larger than the fourth diameter . This achieves the technical advantage that the first screen or the first nozzle on the pump-out connection has a larger diameter than the second screen or the second nozzle on the pump-over connection. As a result, with an identical pumping capacity of the drain pump, a larger quantity of washing suds can be pumped through the pump-out connection piece in a specific time interval than through the pump-over connection piece. This enables the washing suds to be pumped out quickly and effectively from the pump-over system through the pump-out nozzle.

In a further advantageous embodiment of the laundry care appliance, the pump-out connection is connected to a pump-out opening of the laundry care appliance via a pump-out line, the pump-out opening being arranged on an outside of the laundry care appliance at a first height, and the first height being greater than a second height of the tub in the laundry care appliance where the second elevation is the highest point of the pumping system

This achieves the technical advantage that by arranging the pump-out opening on the outside of the laundry care appliance at the first level, which is above the second level of the tub, i.e. above the highest point of the pumping system, the pressure exerted by the drain pump must, in order to pump the washing suds out of the laundry care appliance through the pump-out connection and the pump-out opening, is greater than the pressure that the drain pump has to apply in order to pump out the washing suds through the pump-out connection. Due to the pressure difference between the pumping-out and pumping-over process, an effective direction-dependent selection of pumping-out connection piece and pump-over connection piece with regard to a pumping-out or pump-over process to be carried out can be achieved.

In a further advantageous embodiment of the laundry care appliance, the drain pump has to overcome a pumping-out pressure level during a pumping-out process and a pumping-over pressure level during a pumping-over process, the drain pump being designed to pump out the washing-suds through the pump-over connection piece in a preferred direction of rotation of the impeller over time when there is a pumping-over pressure level to be overcome, and wherein the drain pump is designed to pump out the wash water in a pumping-out direction of rotation of the impeller through the pump-out connector at a pumping-out pressure level to be overcome.

This achieves the technical advantage that the hydraulic design of the suds pump ensures that the washing suds are pumped out during the pumping-out process, or that the washing suds are pumped out during the transfer process. Since the pressure level to be overcome by the drain pump differs between the pump-out and pump-over process, the drain pump is specifically designed, depending on a different pump-out pressure level or pump-over pressure level, either to move the impeller in a pump-out direction of rotation in order to carry out a pump-out process or to move the impeller in a temporal direction To move preferred direction of rotation to perform a pumping operation.

In a further advantageous embodiment of the laundry care appliance, the laundry care appliance comprises a washing drum for receiving laundry and a load detection device for detecting the weight of laundry in the Washing drum, wherein the drain pump is designed to control the speed of the impeller depending on the detected weight of the laundry in the washing drum.

This achieves the technical advantage that the weight of the laundry can be determined by the load detection device, such as a device for determining the weight of the laundry in the washing drum. Depending on the specific weight of the laundry, the speed of the impeller can be increased by the suds pump when there is a large amount of laundry in order to achieve effective pumping of the washing suds and effective wetting of the laundry, whereby effective heating of the washing suds in the pumping system can be ensured.

According to the invention, the drain pump has a heating element, which is designed to heat the wash water in the drain pump.

This achieves the technical advantage that by heating the suds in the suds pump by the heating element due to the high flow rate of suds in the suds pump, a particularly effective transfer of heat from the heating element to the suds is achieved.

Exemplary embodiments of the invention are shown in the drawings and are described in more detail below.

Fig. 1

eine schematische Ansicht eines Wäschepflegegeräts;

Fig. 2

eine schematische Ansicht eines Umpumpsystems mit einem Laugenbehälter und mit einem Steuerelement;

Fig. 3

eine Seitenansicht einer Laugenpumpe; und

Fig. 4

eine Seitenansicht einer Laugenpumpe.

Show it:

1

a schematic view of a laundry care appliance;

2

a schematic view of a pumping system with a tub and with a control element;

3

a side view of a drain pump; and

4

a side view of a drain pump.

1 12 shows a schematic view of a general laundry care appliance 100, such as a washing machine. The laundry care appliance 100 includes a reservoir 101, which is also referred to as a dispensing bowl, and into which detergent or other liquid substances can be filled. The laundry care appliance 100 includes a door 103 for loading the laundry care appliance 100 with laundry.

2 shows a view of a pumping system 105 in a laundry care appliance 100 with a washing drum 107 for holding laundry, with a suds container 109 for holding washing suds, which includes an inlet opening 111 and a drain opening 113 . The inlet port 111 is connected to the outlet port 113 by a line 115 . Line 115 includes a suds pump 117, which can pump the washing suds during a pumping process either through the drain opening 113 out of the suds container 109 and through the inlet opening 111 back into the suds container 109, or during a pumping-out process, the washing suds through the pump-out line 119 from the pumping system 105 can pump out.

During a pump-over process, a large part of the wash liquor in the pump-over system 105 is circulated through the line 115 so that only a part of the wash suds in the pump-over system 105 is present in the tub 109 . During the pumping process, the wash suds in the tub 109 have a pumping level 121 .

Before the pumping out process, the washing suds are no longer pumped through the line 115 but are collected in the suds container 109 in order to be available for pumping out, the washing suds having a pumping level 123 in the suds container 109 . Since the entire washing suds are in the suds container 109 before the pumping out process, the pumping out level 123 is greater than the pumping level 121.

In 3 the schematic representation of a drain pump is shown in a side view. The suds pump 117 comprises a suction chamber 125 into which the washing suds can be sucked out of the line 115 and a pressure chamber 127 from which the sucked washing suds can be delivered back to the pump-over system 105 at an increased pressure. An impeller 129 is arranged in the drain pump 117, which can be designed, for example, as a propeller and can have one or more impeller blades, and can convey the washing liquor from the suction chamber 125 into the pressure chamber 127 at an increased pressure. In 3 the impeller 129 cannot be shown since it is located inside the drain pump 117.

The drain pump 117 also includes a suction nozzle 131 which is arranged on the suction chamber 125 and which is connected to the line 115 of the pump-over system 105 in order to suck in the washing solution. The pressure chamber 127 includes a pump-over connection piece 133 through which the drain pump 117 can convey the washing suds under increased pressure to the line 115 of the pump-over system 105 and to the tub 109 . The pressure chamber 127 also includes a pump-out socket 135 which can be connected to a pump-out line 119 of the laundry care appliance 100 in order to pump out the washing suds from the pump-over system 105 and from the laundry care appliance 100 .

In 4 the schematic representation of a drain pump is shown in a side view. The line of sight in 4 is directed toward the pressure chamber 127 with the cover of the pressure chamber 127 removed to show the interior of the pressure chamber 127. FIG. An impeller 129 is arranged in the drain pump 117, which cannot be seen in the chosen illustration, and which is designed to draw washing suds from the suction chamber 125, which is located in the plane of the drawing behind the pressure chamber 127 and in 4 is not shown, with an increased pressure in the pressure chamber 127 to convey. The drain pump 117 is designed to move the impeller 129 in a preferred direction of rotation 145 over time or in a direction of rotation 147 for pumping out. The preferred direction of rotation 145 in terms of time can be counterclockwise, for example. The direction of rotation 147 for pumping out can be clockwise, for example.

A suction nozzle 131 is arranged on the suction chamber 125 in order to draw in wash liquor from the circulation system 105 . The suction connection is inclined by about 5° with respect to the horizontal axis 151 of the drain pump 117. The pressure chamber 127 includes a pump-over connection piece 133 through which the drain pump 117 can convey the washing suds under increased pressure to the line 115 of the pump-over system 105 and to the tub 109 . The pressure chamber 127 also includes a pump-out connector 135 which is connected to a pump-out line 119 of the laundry care appliance 100 can be connected in order to pump the washing suds out of the pumping system 105 and out of the laundry care appliance 100 . The pump-out connection 135 and the pump-out connection 133 are inclined by approximately 30° with respect to the vertical axis 149 of the drain pump 117 .

The pressure chamber 127 also has a dividing wall 137 with a web 139 which is arranged in the pressure chamber 127 in order to separate a pumped-around region 141 of the pressure chamber 127 from a pumped-down region 143 of the pressure chamber 127 . The pumping area 141 of the pressure chamber 127 is in contact with the pumping connection 133 in order to transport washing liquor from the suction chamber 125 into the pressure chamber 127 while the impeller 129 moves in the preferred direction of rotation 145 over time. The sucked-in wash suds are moved in a circular motion in the preferred direction of rotation 145 in the pressure chamber 127, then conveyed into the pump-around region 141 and can be pumped out of the pressure chamber 127 through the pump-around nozzle 133, which adjoins the pressure chamber 127 tangentially. The dividing wall 137 with the web 139 causes an effective separation between the pumping area 141 and the pumping-out area 143 in order to prevent the washing suds that have been drawn in from being pumped out via the pumping-out area 143 and the pump-out nozzle 135 when the impeller 129 is in the preferred direction of rotation 145 over time can.

Since during operation of the laundry care appliance 100 the drain pump 117 mainly circulates the washing suds in the pumping system 105 and only pumps the washing suds out of the pumping system 105 after the end of the laundry care program, the drain pump 117 is designed in such a way that the preferred direction of rotation 145 over time is preferred to the direction of rotation 147 for pumping out is.

When the impeller 129 moves in the direction of rotation 147 for pumping out, washing liquor is also conveyed from the suction chamber 125 into the pressure chamber 127 . Due to the different pumping directions 147 of the impeller 129, the sucked-in washing suds are moved in a circular motion in the pumping-out direction 147 in the pressure chamber 127, with the pumping-out direction 147 being opposite to the preferred direction of rotation 145 over time. The washing suds are thereby conveyed into the pump-out area 143 and can flow out of the circular pressure chamber 127 through the pump-out nozzle 135, which adjoins the pressure chamber 127 tangentially be pumped out. The partition wall 137 with the web 139 causes an effective separation between the pump-over area 141 and the pump-out area 143 in order to prevent the washing suds that have been drawn in from being able to be pumped out in part via the pump-out area 141 and the pump-out connection piece 133 when the impeller 129 rotates in a pump-out direction 147 .

The function of the suds pump 117 is based on different filling levels of the washing suds in the pump-over system 105 in relation to a pump-over process or a pump-out process. Since the washing suds are no longer bound to the laundry in the washing drum 107 before the pumping out process, but are in the suds container 109 or in the pumping system 105, the fill level in the pumping system 105 before the pumping out process is higher, e.g. 80 cm, than during the pumping out process Circulation process, during which a large part of the suds is bound to the laundry. Due to the different filling levels of the washing suds in the pump-around system 105, a higher pressure is applied to the suds pump 117 during a pump-out process than during a pump-around process. The pressure difference between pumping out and pumping over can be compensated for in the structural design of the drain pump 117 and the line 115 of the hydraulic flows by the optimized design of cross sections and nozzles of the drain pump 117 without disturbing the function of the temporal and hydraulic separation of the two pumping processes.

The fine design for the different flow rates during the pumping or pumping process can be optimized by using curved impeller blades of the impeller 129 with an advantageous geometry, or by using pressure-reducing elements, such as diaphragms and nozzles, on the pump-over connection 133 or on the Pump-out nozzle 135, or by a targeted variation of the speed of the impeller 129 depending on the flow conditions or the flow rates of the washing liquor in the pump-over system 105. For example, the height of the positioning of the drainage opening of the laundry care appliance 100 can also be used to realize a pressure difference between the pumping out process and the pumping around process.

The prerequisite for implementation is the use of a pump motor that is dependent on the direction of rotation, in order to move the impeller 129 of the drain pump 117 in a preferred direction of rotation 145 over time or in a direction of rotation 147 for pumping out.

The drain pump 117 according to the invention thus achieves an effective separation of the pumping-out process and the pumping-over process depending on the different directions of rotation 145, 147 of the impeller 129 of the pump. Only one common motor has to be used for a pump-out and pump-over system 105 of the laundry care appliance 100, which means that there are no costs, e.g. by dispensing with a further set of cables. Due to the pumping process, there is also no need to seal the tub 109 at the sump, since this function avoids carrying over detergent.

Moistening back, or incorrect separation of the flow paths due to a blockage, can be detected and thus prevented by monitoring the motor current using the electrical power of the electrical power present at the drain pump 117 .

Thus, by using the drain pump 117, the entire pumping system 105 can be simplified, whereby a space-saving pumping solution is achieved. The drain pump 117 can also be used in laundry care appliances 100 with conventional pump-over systems 105 without having to change mechanical interfaces, or the conventionally used inlet hose of the pump-over system 105 or the pump-out hose of the pump-out system can be used. By using the pump-over connection piece 133 and the pump-out connection piece 135 , the pump-over or pump-out can be implemented without a specific control of the drain pump 117 .

All of the features explained and shown in connection with individual embodiments of the invention can be provided in different combinations in the object according to the invention in order to realize their advantageous effects at the same time.

The scope of protection of the present invention is given by the claims and is not limited by the features explained in the description or shown in the figures.

Reference List

100

laundry care device

101

reservoir

103

door

105

pumping system

107

washing drum

109

tub

111

intake port

113

drain hole

115

Management

117

drain pump

119

pump-out line

121

pumping level

123

pump level

125

suction chamber

127

pressure chamber

129

Wheel

131

suction port

133

pump-over connection

135

pump out socket

137

partition wall

139

web

141

pumping area

143

pumping area

145

Preferred direction of rotation

147

secondary direction of rotation

149

vertical axis

151

horizontal axis

Claims (13)

1. Laundry care appliance (100) with a recirculation system (105), wherein the recirculation system (105) comprises a tub (109) with an inlet opening (111) and an outlet opening (113), a line (115) which connects the inlet opening (111) and the outlet opening (113) and a detergent-solution pump (117) for pumping detergent solution through the recirculation system (105), having a suction connector (131), having a pressure chamber (127), which has a recirculation connector (133) and a drainage connector (135), and having an impeller (129), wherein

   the detergent-solution pump (117) is embodied to pump the detergent solution through the recirculation connector (133) to the tub (109) in a direction of rotation preferred in terms of timing (145) of the impeller (129) and to pump out the detergent solution through the drainage connector (135) in a drainage direction of rotation (147) of the impeller (129),

   wherein the drainage connector (135) and the recirculation connector (133) are connected tangentially to the pressure chamber (127),

   wherein the drainage connector (135) or the recirculation connector (133) is inclined at a first angle, in particular at an angle of less than 30°, in relation to the vertical axis (149) of the detergent-solution pump (117), or wherein the suction connector (131) is inclined at a second angle, in particular at an angle of less than 90°, in relation to the vertical axis (149) of the detergent-solution pump (117), wherein the vertical axis (149) of the detergent-solution pump (117) is arranged perpendicular to the horizontal axis (151) of the detergent-solution pump (117) and runs centrally between drainage connector (135) and recirculation connector (133) of the detergent-solution pump (117), wherein the horizontal axis (151) of the detergent-solution pump (117) runs approximately parallel to the suction connector (131),

   wherein the laundry care appliance (100) comprises a direction of rotation-dependent pump motor, in order to move the impeller (129) of the detergent-solution pump (117) in the direction of rotation preferred in terms of timing (145) or in the drainage direction (147), characterised in that the detergent-solution pump (117) has a heating element, which is embodied to heat up the detergent solution in the detergent-solution pump (117).
2. Laundry care appliance (100) according to claim 1, characterised in that the pressure chamber (127) has a recirculation area (141) with the recirculation connector (133) and a drainage area (143) with the drainage connector (135).
3. Laundry care appliance (100) according to claim 2, characterised in that a partition wall (137) is arranged between the recirculation area (141) and the drainage area (143), wherein the partition wall (137) has a rib (139) to separate the drainage area (143) from the recirculation area (141).
4. Laundry care appliance (100) according to one of the preceding claims, characterised in that the drainage connector (135) has a first diameter and that the recirculation connector (133) has a second diameter, wherein the first diameter is greater than the second diameter.
5. Laundry care appliance (100) according to one of the preceding claims, characterised in that the impeller (129) has a plurality of impeller blades, wherein the impeller blades are curved.
6. Laundry care appliance (100) according to one of the preceding claims, characterised in that the laundry care appliance (100) includes a power detection element for detecting an electrical power value of the detergent-solution pump (117), that The laundry care appliance (100) has a controller, wherein the controller is embodied to determine a speed of flow of detergent solution in the line (115) as a function of the detected electrical power value of the detergent-solution pump (117), and that the controller is embodied to control the speed of rotation of the impeller (129) as a function of the determined speed of flow of the detergent solution.
7. Laundry care appliance (100) according to claim 6, characterised in that the power detection element comprises a current sensor for detecting a supply current of the detergent-solution pump (117).
8. Laundry care appliance (100) according to one of the preceding claims, characterised in that the laundry care appliance (100) has a reservoir for storage of detergent solution, wherein the drainage connector (135) is connected to the reservoir via a drainage line (119).
9. Laundry care appliance (100) according to one of the preceding claims, characterised in that the detergent-solution pump (117) has, on the drainage connector (135), a first aperture or a first nozzle and/or, on the recirculation connector (133), a second aperture or a second nozzle.
10. Laundry care appliance (100) according to claim 9, characterised in that the first aperture or a first nozzle on the drainage connector (135) has a third diameter, that the second aperture or a second nozzle on the recirculation connector (133) has a fourth diameter, wherein the third diameter is greater than the fourth diameter.
11. Laundry care appliance (100) according to one of the preceding claims, characterised in that the drainage connector (135) is connected via a drainage line (119) to a drainage opening of the laundry care appliance (100), wherein the drainage opening is arranged on an outer side of the laundry care appliance (100) at a first height, and wherein the first height is greater than a second height of the tub (109) in the laundry care appliance (100), wherein the second height is the highest point of the recirculation system (105).
12. Laundry care appliance (100) according to one of the preceding claims, characterised in that, during a drainage process, the detergent-solution pump (117) has to overcome a drainage pressure level and during a recirculation process, the detergent-solution pump (117) has to overcome a recirculation pressure level, and that the detergent-solution pump (117) is embodied, wherein the detergent-solution pump (117) is embodied, for a recirculation pressure level to be overcome, to pump out the detergent solution in a direction of rotation preferred in terms of timing (145) of the impeller (129) through the recirculation connector (133), and wherein the detergent-solution pump (117) is embodied, for a drainage pressure level to be overcome, to pump out the detergent solution in a drainage direction of rotation (147) of the impeller (129) through the drainage connector (135).
13. Laundry care appliance (100) according to one of the preceding claims, characterised in that the laundry care appliance (100) has a laundry drum (107) for receiving laundry and a load detection device for detecting a weight of laundry in the laundry drum (107), and that the detergent-solution pump (117) is embodied to control the speed of rotation of the impeller (129) as a function of the detected weight of the laundry in the laundry drum (107).

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