EP3561170B1 - Haushaltsgerät zur pflege von wäschestücken und verfahren zum betreiben eines haushaltsgeräts - Google Patents

Haushaltsgerät zur pflege von wäschestücken und verfahren zum betreiben eines haushaltsgeräts Download PDF

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Publication number
EP3561170B1
EP3561170B1 EP19165254.4A EP19165254A EP3561170B1 EP 3561170 B1 EP3561170 B1 EP 3561170B1 EP 19165254 A EP19165254 A EP 19165254A EP 3561170 B1 EP3561170 B1 EP 3561170B1
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EP
European Patent Office
Prior art keywords
pump
circulation pump
household appliance
fluid
facility
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP19165254.4A
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German (de)
English (en)
French (fr)
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EP3561170A1 (de
Inventor
Hasan Gökcer ALBAYRAK
Kemal Genc
Raymond Römer
Jörg SKRIPPEK
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication date
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Priority to PL19165254T priority Critical patent/PL3561170T3/pl
Publication of EP3561170A1 publication Critical patent/EP3561170A1/de
Application granted granted Critical
Publication of EP3561170B1 publication Critical patent/EP3561170B1/de
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/10—Filtering arrangements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/42—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to filters or pumps
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/06—Recirculation of washing liquids, e.g. by pumps or diverting valves
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/58—Indications or alarms to the control system or to the user
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/14—Arrangements for detecting or measuring specific parameters
    • D06F34/20—Parameters relating to constructional components, e.g. door sensors
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/081—Safety arrangements for preventing water damage
    • D06F39/082—Safety arrangements for preventing water damage detecting faulty draining operations, e.g. filter blockage, faulty pump
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements
    • D06F39/085—Arrangements or adaptations of pumps

Definitions

  • the invention relates to a household appliance for the care of items of laundry, with a tub in which a laundry drum designed to receive the items of laundry is arranged, and with a pump system which comprises a circulation pump.
  • a fluid can be conveyed from a lower region of the tub into an upper region of the tub by means of the circulation pump.
  • a control device of the household appliance provided for controlling the circulation pump is designed to determine a delivery rate of the circulation pump on the basis of at least one operating parameter of the circulation pump.
  • the invention also relates to a method for operating such a household appliance.
  • washing devices Due to the increased load in modern washing devices, the amount of lint per wash cycle has also increased disproportionately. This is due to the equally increased washing mechanics, i.e. the changed mechanical conditions during the washing process. Such increased demands on dewatering but also on the introduction of washing fluid or washing liquor into the laundry during washing, as well as the increased build-up of lint, can be observed in particular in washing devices that have a load of more than 8 kilograms, for example a load of one Range from 8 kilograms to 12 kilograms.
  • a pump system which, in addition to an emptying pump, includes a circulation pump.
  • This circulation pump conveys the detergent solution or the fluid better and, above all, faster into the items to be washed. This is because the circulation pump conveys fluid from a lower region of the tub into an upper region of the tub.
  • the circulation pump conveys fluid from a lower region of the tub into an upper region of the tub.
  • a pump system which includes a pump-out function and a pump-around function.
  • Separate electric motors are used to drive the circulation pump, which effects the pumping over, and the evacuation pump, which effects the pumping out.
  • the circulation pump which effects the pumping over
  • the evacuation pump which effects the pumping out.
  • the current forming the torque of the pump can be used for this purpose.
  • FIG WO 2009/156326 A2 A corresponding method for recognizing the load status of a pump of a household appliance designed as a washing machine, for example, is shown in FIG WO 2009/156326 A2 described.
  • the DE 10 2014 214 351 A1 a household appliance with a pumping system and with a device for detecting a flow rate of washing liquor, this being designed to determine the flow velocity of the washing liquor on the basis of a detected power of at least one pump of the household appliance.
  • the device for detecting a flow rate of washing liquor can have a flow rate sensor integrated in a line.
  • the strength of the electrical current with which the pump is subjected in pumping mode it can be indirectly detected, for example, whether the corresponding pump delivery flow is established at a selected speed of the pump. Furthermore, it can be determined whether, despite a rotation of a drive wheel or a paddle wheel of the pump, no significant flow rate occurs, for example because the drainage flow paths are blocked.
  • the object of the present invention is therefore to create a household appliance of the type mentioned at the outset, in which the delivery rate of the circulation pump can be determined particularly reliably, and to specify a corresponding, particularly reliable method for operating a household appliance.
  • this object is achieved by a household appliance and a method according to the respective independent claims.
  • the household appliance according to the invention for the care of laundry items comprises a tub in which a laundry drum designed to receive the laundry items is arranged.
  • a pump system of the household appliance comprises a circulation pump, by means of which a fluid can be conveyed from a lower region of the tub into an upper region of the tub.
  • a control device of the household appliance is used to control the circulation pump.
  • the control device is designed to use at least one operating parameter of the circulation pump to determine a delivery rate of at least the circulation pump.
  • the household appliance comprises a flow measuring device.
  • a flow of the fluid through a line of the pump system, via which the fluid can be fed to the circulation pump, can be detected by means of the flow measuring device.
  • the control device is designed to take into account at least one measured value of the flow measuring device when determining the delivery rate of the circulation pump.
  • the control device is designed to infer a delivery flow of the circulation pump based on the at least one operating parameter.
  • the flow measuring device arranged on a suction side of the pump system or connected upstream on the suction side enables information to be obtained about the flow velocity of the fluid which is actually fed to the circulation pump via the line during operation of the pump system.
  • the at least one measured value provided by the flow measuring device of the control device provides a further parameter in addition to the at least one operating parameter of the circulation pump, which enables the control device to refer to the operating state of the pump system, in particular to the operating state of the circulation pump , and to infer the properties of the fluid to be pumped.
  • These properties can in particular include a density of the fluid and / or proportions of a solid phase, a liquid phase and / or a gaseous phase in the fluid.
  • the flow measuring device thus serves as a second or redundant measuring system, which enables the control device to not only take into account the at least one operating parameter of at least one electric motor of the pump system, but also taking into account the at least one measured value of the flow measuring device, i.e. via the flow measurement to infer the operating state of the pump system, in particular the delivery rate or the delivery flow of the circulation pump.
  • the delivery rate or the delivery flow of at least the circulation pump can therefore be determined particularly reliably.
  • variable-speed electric motors are now increasingly being used as drives for pumps.
  • lye pumps and pump systems with an additional circulation pump are used in washing devices, in which, as drives, variable-speed, permanently excited synchronous motors are controlled by a control device.
  • the current pump status can be recognized via the control-related detection of the operating parameters such as the speed and the torque. For example, it can be detected whether the pump used is pumping the full flow rate or whether it has sucked in air, for example. Then the flow is interrupted and the pump has only built up one pressure column and is therefore in what is known as snorkeling or snorkeling mode.
  • the pump is pumping a two-phase fluid or a two-phase washing liquor with a density that is lower than that of the single-phase, i.e. less or less, while the power requirement remains constant, but is reduced compared to pumping a single-phase fluid as good as no foam containing detergent solution is reduced.
  • the operating state of the pump system in particular the delivery rate or the delivery flow of the circulation pump, can be determined particularly reliably. Because it can be verified whether the boundary conditions assumed by the control device when determining the conveying capacity are applicable. This applies in particular to the density of the fluid, which is the basis for the dependence of the delivery rate of the pump on the speed of the electric motor and the delivery rate. If, for example, the circulation pump conveys a denser fluid due to the presence of lint than would be the case if there was less lint, the power requirement of the circulation pump is greater in order to provide a desired flow rate.
  • the actual delivery flow of the fluid conveyed with a certain drive power of the circulation pump can be recorded realistically.
  • the actual delivery rate of the circulation pump is then namely less than would be the case with the given speed and the present torque-generating current Iq, but with a lower density of the fluid.
  • the improved determination of the operating state of the circulation pump and / or the drainage pump of the pumping system therefore applies in particular to operating states in which there is a two-phase fluid to be pumped and in which the torque-generating flow therefore no longer directly affects the value pair of pressure and delivery flow or delivery rate can be closed for a known speed.
  • the pump system is operated in such a way that the circulation pump and / or the drainage pump delivers at a high pressure but a slow flow rate .
  • the household appliance comprising the flow measuring device thus makes it possible to provide a procedural solution for the drainage in which a broken pump delivery flow can be built up again after a relatively short time even after the pump has sucked in air.
  • this suction-side backflow amount of fluid can therefore be reduced again very quickly.
  • This also applies to heavily foamed pumping fluid, in particular fluid to be pumped or pumped off.
  • the complete, desired nominal flow rate of the pump be it the circulation pump or the drainage pump, is built up again, even if the density-reduced, two-phase medium or fluid is present.
  • the delivery flow in particular of the pumping system, can thus be controlled in an improved manner by detecting the at least one operating parameter on the one hand and by taking into account the at least one measured value of the flow measuring device on the other hand.
  • the redundancy measuring method which can be carried out by means of the flow measuring device, enables the flow rate or the conveying capacity to be compared, for example on the basis of the flow velocity that can be detected by means of the flow measuring device.
  • the flow rate can be used to infer the volume flow of the fluid with the aid of the flow measuring device.
  • This enables an even more precise differentiation of the operating states of the pump, be it the circulation pump, by means of which the pumping of the fluid can be effected, or the emptying pump of the pumping system, by means of which the dewatering or pumping out of the fluid can be effected.
  • the household appliance is supplemented by a redundancy measuring system which allows the actual delivery flow of the pumping system to be determined particularly reliably.
  • a particularly load-appropriate flow of the laundry can be achieved, in particular by means of a delivery flow of the pump system or the circulation pump that is adjusted in terms of speed.
  • a delivery flow of the pump system or the circulation pump that is adjusted in terms of speed.
  • blockages can be avoided or identified particularly early. This applies both to the pump paths when the fluid is pumped around or of water and / or washing liquor as well as when pumping out or emptying the tub by means of the emptying pump of the pumping system.
  • a degree of clogging of a filter device can be identified in an improved manner.
  • Such a filter device can also ensure that the items to be washed or the items of laundry are always exposed to filtered fluid or filtered washing liquor when pumping over. This provides a quasi-lint-free washing device or household appliance for the care of items of laundry, which is particularly low-maintenance.
  • the presence of blockages or a degree of blockage of a filter device can be communicated, in particular visualized, to a user or an operator of the household appliance.
  • the provision of the flow measuring device means increased convenience when using the household appliance and secure appliance operation during laundry care.
  • the flow measuring device preferably comprises an impeller arranged in the line of the pump system.
  • the flow rate when the fluid flows through the line can be detected particularly easily and reliably. Accordingly, a volume flow of the fluid as it flows through the line can also be determined very easily by means of the flow measuring device comprising the impeller.
  • the flow measuring device comprising the impeller, it can also be ensured that those properties of the fluid which influence the delivery rate of the pumping system are also present in the area of the impeller and are thus recorded in a particularly realistic manner.
  • the flow measuring device comprises an impeller which is arranged in a bypass line.
  • the bypass line leads from a branch point of the line of the pump system to an orifice. At the mouth opening, the bypass line is connected to a chamber of a pump housing of the pump system and / or to the line of the pump system.
  • a Realize parallel bypass flow which is used to measure the flow through the line of the pump system.
  • This bypass flow or bypass flow is to be understood in a similar way to an electrical parallel connection in which a high-ohmic resistor is arranged in a parallel line branch or bypass branch in order to detect the current strength of the electrical current flowing through the main line.
  • bypass line is thus preferably implemented with a small flow cross section of the parallel measuring section provided by the bypass line.
  • a flow cross-section of the bypass line is preferably selected to be so small that the flow resistance through the line of the pump system turns out to be significantly smaller than the flow resistance over the measuring section or over the bypass line.
  • the impeller arranged in the bypass line just begins to rotate as soon as the fluid flows through the line of the pump system.
  • a braking device can also be provided, which then brakes or brakes the impeller of the flow measuring device when there is currently no evaluation of the data or measured values recorded by the flow measuring device.
  • a mechanical brake can be used as the braking device.
  • a braking effect can be implemented via a magnetic field, which can be generated by energizing a coil.
  • the impeller then preferably has at least one magnetic partial area on which the magnetic field generated by means of the coil can act for braking.
  • the degree of contamination of the line of the pump system can be checked or the main line. A clogging of the pump system on the suction side or an increase in the flow resistance in the pump system on the suction side can thus be reliably detected.
  • the rotation of the impeller arranged in the line of the pumping system and / or of the impeller arranged in the bypass line can be reliably detected by a mechanical counting device. At the same time, however, it is particularly easy to ensure the tightness of the pump system if the rotation of the impeller is detected without contact.
  • a rotation of the impeller can be detected without contact by means of a sensor of the flow measuring device arranged on an outside of the line of the pumping system and / or on an outside of the bypass line.
  • a corresponding rotation of a magnet can be brought about by the rotation of the impeller, for example in that a partial area of the impeller, which rotates about an axis of the impeller, is designed to be magnetic.
  • a magnet can induce a voltage pulse in a coil, which can be recorded as a measured value of the flow measuring device.
  • the sensor arranged on the outside of the line of the pump system or on the outside of the bypass line can be designed as a Hall sensor. In this way, too, the contactless detection of the rotation of the impeller can be implemented in a particularly simple manner.
  • the flow measuring device can be designed as a magneto-inductive flow meter. This is based on the knowledge that both the fluid flowing through the line during operation of the pump system in the form of water and in particular in the form of washing liquor has sufficient electrical conductivity to enable the magnetic-inductive flow measurement.
  • the magnetic-inductive flow measurement can also be used as an alternative or in addition to the provision of the impeller in the bypass line to simply and reliably detect the partial flow of the fluid through the bypass line.
  • Magnetic-inductive flow measurement also has the advantages associated with the contactless detection of the at least one measured value, wherein the measured value can in particular indicate the flow rate of the fluid through the line.
  • magnetic-inductive flow velocity measurement Due to the measuring principle, clogging or blocking of the flow measuring device is excluded, as can otherwise occur in a flow measuring device which has an impeller or measuring impeller.
  • the pump system preferably comprises an emptying pump to which the fluid can be fed via the line.
  • the line is then designed as a suction line or part of a suction line for both the circulation pump and the drainage pump.
  • the circulation pump and the evacuation pump are preferably arranged in a common pump housing of the pump system. In this way, the pumping system can be made very compact.
  • a filter device is arranged in the line of the pump system upstream of the flow measuring device and / or downstream of the flow measuring device.
  • the filter device upstream of the flow measuring device, an impairment of the flow measurement can be avoided in the event that the flow measuring device has a mechanical component that can be moved by the flow of the fluid, for example an impeller such as a worm wheel and / or an impeller.
  • the filter device at least ensures that the flow paths of the pumping system that are used by the circulation pump do not clog when pumping over. This makes it possible to avoid a functional impairment of the pumping system, in particular of the circulation pump.
  • the filter device can be designed in the manner of a sieve, which is used in particular to hold back hair, lint and the like. Additionally or alternatively, the filter device can be designed as a foreign body trap, which serves to hold back larger foreign bodies such as coins, hair clips or similar small parts. If such a filter device is provided, the flow measuring device can also be used to infer that the filter device is clogged.
  • the filter device is designed as a foreign body trap, it can be provided that through the foreign body trap foreign bodies on the suction side or respectively Entrance side of the pumping system are retained, but lint can be pumped around at least to a small extent by means of the pumping system, in particular the circulation pump. What is achieved thereby is that maintenance intervals are comparatively long, or maintenance does not need to be carried out unnecessarily often and therefore with a frequency that is troublesome for an operator or a user of the household appliance.
  • the filter device in the structural design of the filter device as a foreign body trap and / or as a lint filter, different priorities can be set or aspects can be taken into account depending on the specifications or requirements. Aspects of this kind can protect the pumping system, the frequency of maintenance or the length of maintenance intervals, retention capacity for foreign bodies, the potential of the pumping system to pump fluid with lint, accessibility to the filter device, visibility or accessibility of the pumping system for the user or for the operator of the household appliance and the like.
  • the filter device designed as a foreign body trap or sieve filter or the like it is therefore important to find an optimal compromise in which a number of criteria are preferably implemented together in the best possible way. These criteria can include retention of foreign bodies due to the geometry of the filter device, incorrect installation, accessibility and / or visibility of that area of the pump system in which the filter device is arranged, a possibility of dismantling the filter device even if at least one There is a foreign body blockage of the filter device, a possibility of cleaning the filter device by operating the pump system, as well as a rinsing functionality for removing hair and / or lint from the filter device.
  • criteria can include retention of foreign bodies due to the geometry of the filter device, incorrect installation, accessibility and / or visibility of that area of the pump system in which the filter device is arranged, a possibility of dismantling the filter device even if at least one There is a foreign body blockage of the filter device, a possibility of cleaning the filter device by operating the pump system, as well as a rins
  • the filter device is arranged in an inlet-side chamber of the pump housing from which the fluid can be fed to the drain pump.
  • the filter device can be implemented by a suction pipe shield, so that both the circulation pump and the drainage pump have a filter grille or the like is connected upstream as the filter device.
  • a labyrinth filter can be provided as a filter device for the drainage pump and the circulation pump.
  • the filter device has at least one wall area designed to retain solids from the fluid, from which solids can be removed by operating the drain pump.
  • a sequential, time-shifted activation of the circulation pump and then the emptying pump can cause the filter device to be cleaned. This is because the operation of the drain pump following operation of the circulation pump ensures that the solids retained on the at least one wall area are rinsed off the wall area again.
  • Such a self-cleaning function can be easily implemented if, for example, a parallel suction pipe guide is provided in the filter device. Accordingly, suction areas, via which the fluid is supplied to the circulation pump on the one hand and to the drainage pump on the other hand, are aligned essentially parallel to one another in the area of the filter device. This facilitates the rinsing of lint and / or hair or such solids from the at least one wall area of the filter device by operating the drainage pump.
  • the filter device can in this case be arranged in an inlet-side chamber of the pump housing designed as a pot-type housing and / or configured in the manner of a pot-type housing.
  • a concept is implemented in the filter device in which a suction area or a suction pipe of the circulation pump and a suction area or a suction pipe of the evacuation pump are aligned essentially at right angles to one another.
  • a transverse perforation can be provided in the wall area.
  • the inlet into that chamber of the circulation pump in which a drive wheel or paddle wheel of the pump is located can be referred to as the suction mouth.
  • the inlet-side chamber of the pump housing preferably has a closure element, the filter device being accessible or visible for maintenance after the closure element has been opened and / or can be removed from the inlet-side chamber.
  • maintenance of the filter device can be carried out in a particularly simple manner, in particular when a conclusion is drawn that the filter device is clogged on the basis of the measured values of the flow measuring device.
  • the control device is preferably designed to change a speed and / or a direction of rotation of an electric motor of the circulation pump and / or of an electric motor of a drain pump of the pumping system if a delivery rate determined based on at least one operating parameter of the circulation pump and / or the drain pump is from a of the at least one measured value of the flow measuring device determined delivery rate of the circulation pump and / or the evacuation pump deviates.
  • This is based on the knowledge that by changing the speed of the electric motor it is particularly easy to restore a state in which the circulation pump or the evacuation pump actually delivers the desired flow rate. This can be achieved, for example, after drawing in air or when drawing in a foam-water mixture with a high content of foam, by reducing the speed of the electric motor.
  • the delivery rate that can be achieved by means of the circulation pump or the evacuation pump can, however, also be dependent on a direction of rotation of a drive wheel or paddle wheel of the respective pump.
  • the delivery rate of the circulation pump or the drainage pump can then also be changed by reversing the direction of rotation while maintaining the same speed.
  • the electric motor of the circulation pump and / or the electric motor of the evacuation pump are preferably designed as variable-speed and permanent-magnet synchronous motors that are flexible or variable in the direction of rotation. This is because the use of such electric motors makes it particularly easy to achieve a desired tightness of the pump system.
  • control device is designed to detect and / or localize a blockage in the pumping system.
  • control device preferably uses the at least one measured value which is made available to the control device by the flow measuring device.
  • the delivery flow determined on the basis of the current requirement of the drain pump corresponds to the delivery flow which results from taking into account the at least one measured value of the flow measuring device, it can be concluded that there is a blockage in that area of the pumping system which is to circulation pump, or that the blockage is downstream of the circulation pump.
  • the control device is preferably designed to communicate the presence of the blockage to an operator or a user of the household appliance.
  • the operator or the user of the household appliance can thus be informed or appropriately warned about the degree of blockage, in particular of a filter device in a suction chamber of the pump system.
  • a degree of clogging in particular the filter device of the pump system, can be determined by a Decrease in the delivery rate of the circulation pump and / or a drain pump of the pumping system can be detected.
  • control device can be designed to at least reduce the blockage by controlling the circulation pump and / or the drainage pump of the pump system.
  • a corresponding cleaning of the suction side of the pump system can therefore be achieved in particular by operating the circulation pump and the drainage pump alternately.
  • the blockage can at least be reduced or at least partially eliminated in a simple manner.
  • control device is designed to change a delivery rate of the circulation pump as a function of a load on the laundry drum with items of laundry, and to control the change in the delivery rate using the at least one measured value of the flow measuring device.
  • the amount of water can therefore be adapted to the respective load depending on the laundry load of the laundry drum.
  • the delivery flow or the delivery rate of the circulation pump is changed accordingly, for example by changing the speed of an electric motor of the circulation pump. This change in the delivery rate can be checked particularly easily with the aid of the flow measuring device.
  • a controllable, load-appropriate laundry flow can always be ensured.
  • a control device of the household appliance controls the circulation pump.
  • the control device uses at least one operating parameter of the circulation pump to determine a delivery rate of at least the circulation pump.
  • the household appliance comprises a flow measuring device, by means of which a flow of the fluid through a line of the pump system is detected. Via the management of the Pump system, the fluid is fed to the circulation pump.
  • the control device takes into account at least one measured value from the flow measuring device. In this way, the delivery rate of the circulation pump is determined particularly reliably. Furthermore, by taking into account the at least one measured value, a delivery rate of an emptying pump of the pumping system can also be determined particularly reliably.
  • top, bottom, front, bottom, front, back, “horizontal”, “vertical”, “depth direction”, “width direction”, “height direction” and the like are those with intended use and intended arrangement of the household appliance and given positions and orientations given to an observer standing in front of the device and looking in the direction of the household device.
  • a household appliance 1 for the care of items of laundry is shown in a highly schematic manner, which can be, for example, a washing machine or a washer-dryer.
  • the household appliance 1 comprises a housing 2 in which a laundry drum 3 is rotatably mounted. An axis of rotation of the laundry drum 3 is shown in FIG Fig. 1 oriented perpendicular to the plane of the figure.
  • the household appliance 1 also includes a Lye container 4, which is also arranged in the housing 2, and which surrounds the laundry drum 3.
  • the laundry drum 3 comprises a hollow cylindrical jacket and a rear end wall (not shown).
  • the laundry drum 3 On the front side, the laundry drum 3 is designed to be open, so that the laundry drum 3 has a loading opening via which the laundry items can be introduced into a receiving space 5 of the laundry drum 3.
  • the loading opening can be closed by a door 6 which is movably arranged on the housing 2.
  • a vertical direction (y direction), a width direction (x direction) and a depth direction (z direction) are in Fig. 1 illustrated by a right-angled coordinate system.
  • a pump system 7 which comprises a circulation pump 8 and a drain pump 9 (cf. Fig. 2 ).
  • a first electric motor 10 is used to drive the circulation pump 8 and a second electric motor 11 is used to drive the evacuation pump 9.
  • the circulation pump 8 and the evacuation pump 9 are arranged in a common pump housing 12 of the pump system 7.
  • the circulation pump 8 is used to convey a fluid such as detergent solution and / or, for example in a rinsing step of a washing program of the household appliance 1, water from a lower region 13 of the tub 4 into an upper region 14 of the tub 4 (cf. Fig. 1 ). In this way, the washing liquor or the water is conveyed better and, above all, faster into the laundry than is the case when such a fluid is conveyed solely through the rotation of the laundry drum 3.
  • the fluid coming from the lower region 13 of the tub 4 is fed to the pump system 7 and thus also to the circulation pump 8 via a suction line 15, from which a suction nozzle 16 belonging to the pump system 7 in Fig. 2 is shown in perspective.
  • the fluid to be pumped out of the tub 4 by means of the drain pump 9 is also fed to the drain pump 9 via the same suction nozzle 16 or such a line of the pump system 7.
  • a pressure port 17 of the drain pump 9 is shown in FIG Fig. 2 shown in perspective.
  • the pressure port 17 serves as a water outlet for pumping out.
  • the pressure port 18 of the circulation pump 8 shown in perspective serves as a water outlet for the pumping over. From the pressure port 18 leads into Fig. 2 Line 19, shown in detail, to the upper area 14 of the tub 4 (cf. Fig. 1 ).
  • a control device 20 is provided, which is shown in FIG Fig. 1 is shown schematically.
  • the control device 20 or the control device of the household appliance 1 is designed to measure operating parameters of the circulation pump 8 and the evacuation pump 9 such as a speed of the respective electric motor 10, 11, a direction of rotation of paddle wheels 21, 22 of the respective pump and driven by the electric motors 10, 11 to record and evaluate the like.
  • the impeller 21 of the circulation pump 8 is in Fig. 6 can be seen, and the impeller 22 of the evacuation pump 9 is in Fig. 16 shown.
  • the control device 20 processes the electrical current taken up by the respective electric motor 10, 11, on the magnitude or strength of which the torque that is applied by the respective paddle wheel 21, 22 depends.
  • the delivery capacity of the circulation pump 8 on the one hand and the drain pump 9 on the other hand is inferred. If the fluid conveyed by the respective pump of the pumping system 7 has a known density, a corresponding delivery rate of the circulation pump 8 or the evacuation pump 9 results with a respective current consumption of the electric motor 10, 11 and a respective speed of the paddle wheel 21, 22 or the delivery rate changes, however, if the density of the fluid to be delivered changes at the same speed of the electric motor 10, 11 or of the paddle wheel 21, 22. On the one hand, the density of the fluid can increase if lint is conveyed together with the washing liquor or the water.
  • the density of the fluid can decrease if the fluid contains a comparatively large amount of foam and is therefore no longer in a single phase, but as a two-phase foam-water mixture. If such changes in density occur, a characteristic curve used by the control device 20 to determine the delivery rate of the circulation pump 8 or the drainage pump 9, which can be stored in a memory of the household appliance 1, in particular in a memory of the control device 20, no longer applies unrestricted.
  • the household appliance 1 has a flow measuring device or a flow sensor 23, which is shown in FIG Fig. 1 is shown schematically. A flow of the fluid through the suction connector 16 or suction connector can be detected via the flow sensor 23. The flow sensor 23 can therefore be used to detect the volume flow with which the fluid is supplied to the circulation pump 8 or the drainage pump 9.
  • control device 20 takes into account at least one measured value that can be recorded by means of the flow sensor 23 in addition to the operating parameters of the circulation pump 8 or the evacuation pump 9, the actual delivery rate of the circulation pump 8 or the evacuation pump 9 can be determined particularly reliably. Because by means of the flow sensor 23, the flow or the flow of the fluid through the suction nozzle 16 is detected, that is, through a line via which the circulation pump 8 or the evacuation pump 9 is supplied with the fluid. For this purpose, the flow sensor 23 can detect a flow velocity of the fluid and output corresponding measured values to the control device 20. On the basis of the known flow-through cross-section of the suction connector 16, conclusions can then be drawn about the volume flow of the fluid.
  • the flow sensor 23 connected upstream on the suction side provides information about the flow rate of the fluid when it enters the pump system 7. Based on a knowledge of the volume flow that can be derived therefrom, which can thus be detected by the flow sensor 23, the characteristic curve can be adapted, for example, which is a specifies a specific speed of the respective impeller 21, 22 and, given a specific current taken up by the respective electric motor 10, 11, a respective delivery rate of the circulation pump 8 or the evacuation pump 9.
  • a blockage of the pump system 7 can be detected and localized.
  • the speed of the respective impeller 21, 22 and / or the The direction of rotation of the respective paddle wheel 21, 22 can be changed, for example, in the event that the circulation pump 8 or the evacuation pump 9 sucks in air in an undesired manner.
  • a removable closure element 25 is arranged on an inlet-side chamber 24 of the pump housing 12.
  • opening the closure element 25, which can be designed, for example, as a screw cap with a handle part 26, access to a filter device 27 can be established, which is arranged in the chamber 24 and in Fig. 3 is shown schematically and in perspective.
  • FIG. 3 the flow path from the water inlet or suction nozzle 16 to the water outlet or pressure nozzle 17 of the evacuation pump 9 is also shown by arrows 28.
  • Arrows 29 indicate the flow path from the suction connection 16 to the pressure connection 18 of the circulation pump 8, that is to say to the water outlet used for pumping over.
  • the for example generally tubular filter device 27 has an inlet 30 through which the fluid coming from the suction port 16 enters an interior space 31 of the filter device 27 both when the circulation pump 8 and when the drain pump 9 is operated. Via an outlet 32, which in the present case is oriented perpendicular to the suction nozzle 16, the fluid can pass from the interior space 31 into a pressure chamber 33 of the emptying pump 9, in which the impeller 22 of the emptying pump 9 is located (cf. Fig. 16 ).
  • the filter device 27 has a wall area 34 which has a first wall part 35 with passage openings 36 (cf. Fig. 3 ) and a second impermeable wall part 37.
  • the wall area 34 is V-shaped, the wall part 35 with the passage openings 36 and the wall part 37, which is impermeable, forming the legs of the V-shape. A vertex of the V-shape extends into the interior space 31 at the wall area 34 lint and hair can be held back when the fluid passes through the passage openings 36.
  • the wall area 34 serves as a foreign body trap to hold back larger small parts, so that these small parts or foreign bodies cannot get into a pressure chamber 38 of the circulation pump 8 in which the impeller 21 of the circulation pump 8 is arranged (cf. Fig. 6 ).
  • the closure element 25 By removing the closure element 25, not only is access to the filter device 27 possible, but the filter device 27 can preferably also be removed from the chamber 24.
  • hair and lint which are retained on the side of the wall part 35 facing the interior 31 can be removed or rinsed off by activating the circulation pump 8 and then the drainage pump 9 in succession. This is because the fluid which leaves the filter device 27 via the outlet 32 takes along the hair and lint which are retained on the wall part 35 by the filter device 27.
  • FIG. 5 is chamber 24 (compare Fig. 2 ) and also the filter device 27.
  • a first, thick line 39 illustrates the flow of the fluid via the suction port 16 into the interior 31 of the filter device 27.
  • Another line 40 illustrates the flow of the fluid through the filter device 27 and then further over the Pressure chamber 33 of the evacuation pump 9 (cf. Fig. 4 ) to the pressure port 17 for pumping out.
  • Another line 41 illustrates the flow of the fluid from the interior space 31 to a wall 42 of the filter device 27 (cf. Fig. 4 ), at which the fluid is deflected and thus conveyed to the pressure chamber 38 of the circulation pump 8.
  • the lines 40, 41 run parallel. Accordingly, in Fig. 5 a variant of the filter device 27 is shown in which a parallel suction pipe guide is implemented.
  • a variant of the filter device 27 is shown in which a suction pipe transverse perforation is implemented.
  • the thick line 39 illustrates the entry of the fluid via the suction nozzle 16 into an interior 43 of the filter device 27. From this interior 43, the fluid passes via a plurality of transverse holes 44 to the pressure chamber 38, in which the impeller 22 of the circulation pump 8 is located is located.
  • Corresponding thin lines 45 illustrate the flow path through the transverse holes 44.
  • An arrow 46 illustrates the exit of the fluid through the pressure port 18 of the circulation pump 8, and an arrow 47 illustrates the exit of the fluid through the pressure port 17 of the evacuation pump 9.
  • a variant is shown in which the flow sensor 23 comprises a worm wheel 48 as an impeller.
  • a longitudinal axis 49 of the worm wheel 48 is aligned with a longitudinal axis of the suction connector 16.
  • a worm 50 of the worm wheel 48 has at least one partial area formed from a magnetic material.
  • a rotation of the worm wheel 48 about the longitudinal axis 49 can thus be detected, for example, by means of a Hall sensor 51 of the flow measuring device.
  • the Hall sensor 51 is arranged on an outside of the suction connector 16.
  • the impeller of the flow sensor 23 is not designed as a worm wheel 48, but as an impeller 52.
  • an axis of rotation 53 of the impeller 52 runs perpendicular to a flow direction of the fluid as it passes through the suction port 16.
  • the impeller 52 as well as the filter device 27 are shown in section.
  • At least one blade 54 of the impeller 52 has a partial area 55 made of a magnetic material or a magnetic rod.
  • the rotation of this sub-area 55 about the axis of rotation 53 can be detected by means of the Hall sensor 51 of the flow measuring device.
  • the impeller 52 is arranged upstream of the inlet 30 of the filter device 27 in the suction nozzle 16.
  • the end Fig. 10 it can be clearly seen how the impeller 52 can be set into rotation about the axis of rotation 53 due to the fluid flowing through the suction nozzle 16.
  • the end Fig. 11 is again clearly shown how the fluid can reach the pressure chamber 33 of the drainage pump 9 via the outlet 32 of the filter device 27.
  • Fig. 12 shows the impeller 52 of the flow sensor 23 in an enlarged perspective view, with the partial area 55 of the blade 54 formed from the magnetic material being located at the height of the Hall sensor 51.
  • the flow sensor 23 is implemented in that a worm wheel 56 or an impeller (not shown) is arranged in a bypass line 57 or bypass line.
  • the Hall sensor 51 is in turn arranged on an outside of the bypass line 57.
  • the bypass line 57 branches off from the suction port 16 at a branch point 58.
  • a partial flow of the fluid which has flowed through the bypass line 57 or bypass line re-enters the pump housing 12 of the pump system 7.
  • the fluid to be pumped is then fed to the circulation pump 8.
  • the orifice 59 is connected to the inlet-side chamber 24 of the pump housing 12 (cf. Fig. 2 ) connected.
  • the mouth opening 59 is connected to the suction nozzle 16.
  • the flow resistance through the bypass line 57 is so large, in particular due to the arrangement of the worm wheel 56 in the bypass line 57, and a cross-section of the bypass line 57 that can be flown through is so small that the main flow of the fluid always enters the chamber 24 via the suction nozzle 16 (cf. Fig. 2 ) entry.
  • a flow through the suction connection 16 causes the worm wheel 56 or such an impeller of the flow sensor 23 to rotate. This rotation is detected by means of the Hall sensor 51.
  • the flow rate of the fluid when flowing through the suction nozzle 16 can be determined without contact and thus the volume flow of the fluid which is fed to the circulation pump 8 or the drainage pump 9.
  • the hydraulic parallel connection of the flow sensor 23 the Flow velocity or the volume flow in the suction-side pump inflow can be detected.
  • FIG. 14 Based on Fig. 14 the connection between the electrical drive power of the circulation pump 8 and a blockage of the filter device 27 is to be illustrated schematically.
  • the drive power provided by the electric motor 10 is here on an ordinate 62 of an in Fig. 14 graph 63 shown.
  • the degree of clogging is indicated in percent on an abscissa 64 of the graph 63.
  • a curve 65 illustrates schematically how the drive power of the electric motor 10 of the circulation pump 8 decreases when the filter device 27 is increasingly clogged. With increasing blockage of the filter device 27, increasingly less water reaches the impeller 21 of the circulation pump 8. As a result, a lower drive power of the electric motor 10 is required in order to bring about the rotation of the impeller 21.
  • the paddle wheel 21 of the circulation pump 8 rotates, so to speak, in the dry, so that only a low drive power of the electric motor 10 of the circulation pump 8 is required to achieve a certain speed of the paddle wheel 21.
  • the pump motor power of the corresponding drive or electric motor 10, 11 of the respective pump can be evaluated by the measured variables of the motor speed, the motor current and thus also the motor torque, so to speak.
  • the clogging of the filter device 27 plays a role here, as indicated by curve 65 in FIG Fig. 14 is illustrated schematically.
  • Fig. 15 the pump housing 12 is shown with the closure element 25 removed.
  • the filter device 27 is accordingly accessible. Also from the sectional view in Fig. 16 it can be clearly seen that after the closure element 25 has been opened, the filter device 27 is accessible to a user of the household appliance 1.
  • the closure element 25 can have an external thread 60 which can be brought into engagement with an internal thread 61 provided on the side of the pump housing 12 in order to fasten the closure element 25 to the pump housing 12 and thus the To secure filter device 27 in their position.
  • the filter device 27 is shown removed from the chamber 24 of the pump housing 12.
  • Fig. 18 shows the filter device 27 removed from the chamber 24 of the pump housing 12 in a further perspective view.
  • both pump motors namely the electric motor 10 of the circulation pump 8 and the electric motor 11 of the drainage pump 9, are connected to a common pump antechamber, namely the inlet-side chamber 24 of the pump housing 12.
  • This inlet-side chamber 24 can also be referred to as a suction chamber or as a filter chamber if, as is preferred in the present case, the filter device 27 is arranged in the chamber 24.
  • the flow sensor 23 is provided, which makes it possible to detect the flow rate of the fluid at a location with a known flow cross section.
  • the flow velocity can be determined without contact by means of the Hall sensor 51 or directly, for example by using a turbine wheel counter. Furthermore, a magnetic-inductive flow meter can also be used as the flow measuring device.
  • the flow sensor 23 can be integrated into the flow before the filter element or the filter device 27 or after the filter device 27. In the figures, the flow sensor 23 is shown integrated into the suction-side pump inflow, with reference to FIG Fig. 13 described variant a hydraulic parallel connection of the flow sensor 23 is realized. Here the flow sensor 23 is arranged on or in the bypass line 57, and the flow sensor 23 nevertheless makes it possible to detect the flow velocity and thus the volume flow in the suction nozzle 16.
  • the water supply or the lye supply is implemented via the common suction nozzle 16 in the present case.
  • the outlet for the waste water and the outlet for the pumping over are each implemented separately, so that the pressure port 18 is provided for the function of pumping and the pressure port 17 for the function of draining.
  • the pumping system 7 is the common, by removing the closure element 25 accessible and preferably removable filter device 27 or such a filter system is provided. In this way, lint and / or foreign bodies can be kept away from the paddle wheels 21, 22 of the circulation pump 8 and the drainage pump 9.
  • a filter device keeps lint and / or foreign bodies away from an impeller of the flow sensor 23.
  • the electric motors 10, 11 of the pumps are preferably designed as synchronous motors with permanent magnets, that is to say as permanent magnet synchronous motors, which are driven or controlled by a common inverter electronics.
  • inverter electronics can be integrated into the control device 20.
  • a corresponding relay can then switch the electric motor 10, 11 to be controlled in each case.
  • the delivery rate of the circulation pump 8 or the evacuation pump 9 can be determined.
  • information about the degree of clogging of the pump system 7 or other routes of the fluid or water through the tub 4 can then be obtained, for example.
  • the evaluation of the recorded measured variables via the degree of blockage of the pump system 7 or other waterways can be evaluated for the user or such an operator of the household appliance 1.
  • specific cleaning suggestions or maintenance suggestions can be made to the user, for example that the chamber 24 and / or the filter device 27 inserted into the chamber 24 should be cleaned.
  • a need for cleaning is illustrated by the decrease in pump drive power.
  • corresponding cleaning methods can be provided, in particular by alternating operation of the circulation pump 8 and the drainage pump 9.
  • the amount of water or the flow rate of the fluid that the circulation pump 8 conveys from the lower region 13 of the tub 4 to the upper region 14 of the tub 4 can be changed to suit the load (cf. Fig. 1 ).
  • This adaptation of the delivery flow or the delivery rate of the circulation pump 8 can be carried out by controlling the speed of the electric motor 10 of the circulation pump 8 and controlled with the aid of the flow sensor 23. In this way, a controllable, load-appropriate laundry flow can always be ensured, in particular by means of a variable-speed control of the circulation pump 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP19165254.4A 2018-04-25 2019-03-26 Haushaltsgerät zur pflege von wäschestücken und verfahren zum betreiben eines haushaltsgeräts Active EP3561170B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL19165254T PL3561170T3 (pl) 2018-04-25 2019-03-26 Urządzenie gospodarstwa domowego do pielęgnacji artykułów pralniczych i sposób eksploatacji urządzenia gospodarstwa domowego

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DE102018206364.8A DE102018206364A1 (de) 2018-04-25 2018-04-25 Haushaltsgerät zur Pflege von Wäschestücken und Verfahren zum Betreiben eines Haushaltsgeräts

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EP4015698A1 (en) * 2020-12-15 2022-06-22 Vestel Elektronik Sanayi ve Ticaret A.S. Washing machine and method of unclogging a drain filter of a washing machine
DE102021202010A1 (de) 2021-03-03 2022-09-08 BSH Hausgeräte GmbH Waschmaschine mit Umpumpsystem und Verfahren zu deren Betrieb

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DE10318862B4 (de) * 2002-12-18 2006-03-09 BSH Bosch und Siemens Hausgeräte GmbH Wasserführendes Haushaltgerät mit einer Entleerungspumpe sowie Entleerungspumpe
DE102008029910C5 (de) * 2008-06-24 2020-03-05 BSH Hausgeräte GmbH Verfahren zur Lastzustandserkennung einer Pumpe
DE102011088204A1 (de) * 2011-12-12 2013-06-13 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät, insbesondere Geschirrspülmaschine, und Verfahren
DE102014214351A1 (de) * 2014-07-23 2016-01-28 BSH Hausgeräte GmbH Haushaltsgerät mit einem Umpumpsystem
DE102014222050B3 (de) * 2014-10-29 2016-03-31 BSH Hausgeräte GmbH Wäschepflegegerät mit einer Laugenpumpe
AT516622B1 (de) * 2015-03-24 2016-07-15 Avl List Gmbh System zur Messung von zeitlich aufgelösten Durchflussvorgängen von Fluiden
DE102015214803A1 (de) * 2015-08-04 2017-02-09 BSH Hausgeräte GmbH Wäschepflegegerät mit einem Zirkulationssystem
JP6357453B2 (ja) * 2015-08-19 2018-07-11 日立アプライアンス株式会社 洗濯乾燥機
DE102016204347A1 (de) * 2016-03-16 2017-09-21 BSH Hausgeräte GmbH Verfahren zum Betrieb eines wasserführenden Haushaltsgeräts mit verbessertem Pumpbetrieb

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DE102018206364A1 (de) 2019-11-21
CN110396804B (zh) 2023-08-22
CN110396804A (zh) 2019-11-01
PL3561170T3 (pl) 2022-01-10

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