EP1566477A1 - Electric household appliance utilising a liquid - Google Patents

Electric household appliance utilising a liquid Download PDF

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Publication number
EP1566477A1
EP1566477A1 EP05100684A EP05100684A EP1566477A1 EP 1566477 A1 EP1566477 A1 EP 1566477A1 EP 05100684 A EP05100684 A EP 05100684A EP 05100684 A EP05100684 A EP 05100684A EP 1566477 A1 EP1566477 A1 EP 1566477A1
Authority
EP
European Patent Office
Prior art keywords
motor
characterized
liquid
pump
measuring circuit
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.)
Withdrawn
Application number
EP05100684A
Other languages
German (de)
French (fr)
Inventor
Hans-Wilhelm Klein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgaraete GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE200410007246 priority Critical patent/DE102004007246A1/en
Priority to DE102004007246 priority
Application filed by BSH Bosch und Siemens Hausgaraete GmbH filed Critical BSH Bosch und Siemens Hausgaraete GmbH
Publication of EP1566477A1 publication Critical patent/EP1566477A1/en
Withdrawn legal-status Critical Current

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Classifications

    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08Liquid supply or discharge arrangements
    • D06F39/083Liquid discharge or recirculation arrangements
    • D06F39/085Arrangements or adaptations of pumps
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00Washing or rinsing machines for crockery or tableware
    • A47L15/42Details
    • A47L15/4214Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225Arrangements or adaption of recirculation or discharge pumps
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00Washing or rinsing machines for crockery or tableware
    • A47L15/42Details
    • A47L15/4287Temperature measuring or regulating arrangements
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/04Heating arrangements
    • D06F39/045Temperature measuring or regulating devices
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/08Drain or recirculation pump parameters, e.g. pump rotational speed or current absorbed by the motor
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/30Variation of electrical, magnetical or optical quantities
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47LDOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00Output in controlling method of washing or rinsing machines for crockery or tableware, i.e. quantities or components controlled, or actions performed by the controlling device executing the controlling method
    • A47L2501/06Water heaters

Abstract

A domestic electrical appliance comprises a chamber (1) at least partially filled with liquid during operation of the appliance, a pump (5) for circulating the liquid and a motor (9) driving the pump (5) in thermal contact with the liquid standing winding arrangement (U, V, W). The winding arrangement (U, V, W) is associated with a measuring circuit (24-29) for detecting the electrical resistance value of the winding arrangement. <IMAGE>

Description

The present invention relates to a household electrical appliance with a during operation of the device at least partially filled with liquid Chamber and a pump driven by a motor Circulating the liquid. With such a household appliance it can in particular a dishwasher or washing machine, and at the pump to a drain pump, the cleaning solution A lower part of the chamber sucks to keep it in the chamber arranged to be cleaned, to be cleaned or sprayed out of the chamber pump out.

The cleaning solution in such a household appliance must be on a predetermined operating temperature can be maintained. To capture the Temperature is generally a temperature sensor such as a Thermocouple in as close as possible thermal contact with the Cleaning solution placed. The installation of such a sensor requires Costs and labor.

To save on parts costs and assembly costs, it would be desirable to have a household appliance in which to Detecting the temperature of the cleaning solution or another in the device circulating liquid such a temperature sensor is not is required.

The problem is solved by a household appliance with the features of Claim 1.

The invention makes use of the fact that the windings are for pumping Of the fluid used pump motor often in thermal Contact with the liquid leading parts so that theirs Temperature closely follows that of the liquid, and that most for the Making the winding suitable materials one have temperature-dependent resistivity, so off Fluctuations in the resistance of the windings a conclusion to the temperature of the windings is possible, in turn, with the Fluid is closely correlated. From the development of the electric Resistance value of the winding arrangement is therefore a conclusion possible on the temperature of the liquid.

In general, a household appliance of the above type has over a heater for heating the liquid and a Control device for controlling the operation of the heater. These can suitably the detected resistance value for the Use temperature control.

Preferably, the motor of the pump of the machine according to the invention a wet runner, d. H. the runner is in a filled with the liquid Housed chamber forming part of the pump. This construction ensures a close thermal coupling of both the runner and also of the chamber surrounding the stator of the engine to the Liquid.

The winding assembly, whose resistance is measured, can be a single winding, the entirety of the windings of the motor or a between these two extremes lying number of windings include. In the case of a motor with windings in star configuration is the resistance measurement on the whole of the windings or on one Series connection of two windings particularly easy to implement.

To compromise the accuracy of the resistance measurement to avoid inductions in the engine, the measuring circuit performs the Resistance measurement preferably with the engine off.

If the motor is powered by an inverter, are for detection the resistance value of the winding assembly preferably a Current measuring circuit for measuring the current flow through the Inverter and / or a voltage measuring circuit for measuring the Input voltage of the inverter provided from the Measurement results of the resistance value taking into account the Voltage drop in the inverter can be calculated.

Other features and advantages of the invention will become apparent from the below description of embodiments below Reference to the attached figures.

Show it:

Fig. 1
a schematic section through an inventive Dishwasher;
Fig. 2
a block diagram of the motor of the circulation pump of Dishwasher of Figure 1 and its supply electronics.
Fig. 3
a section through an assembly in which the pump, the Motor and the supply electronics are summarized.

Fig. 1 shows a schematic section through a dishwasher with a rinsing chamber 1, in the usual way baskets 2, 3 on rails guided are pulled out. In a depression at the bottom of the Flushing chamber 1 is a flushing water filter 4, through which a pump 5 explained in more detail later with reference to FIGS. 2 and 3 Rinsing aspirates to rotatable about lines 12, 13 rotatably mounted To feed nozzle arms 6, 7, each mounted under the baskets 2, 3 are to spray on the dishes contained therein. An electrical Heating rod 8 is mounted on the bottom of the washing chamber 1 and serves for Heating the rinse liquor.

The pump 5 is driven by a brushless DC motor 9.

An electronics block for driving the motor 9 and the heating element 8 according to a washing program selected by the user, in FIG collectively denoted by 20. Fig. 2 shows in more detail in shape a block diagram of the structure of the electronics block 20. The motor. 9 has three stator windings, labeled U, V, W here in one Star configuration are interconnected. The supply electronics block 20 includes a mains rectifier 21, which is an intermediate DC voltage supplies. This DC intermediate voltage feeds three phases Inverter 22, each of which two switches in series SU1, SU2 or SV1, SV2 or SW1, SW2, each in the form of a Power transistor with parallel recovery diode includes. The point between two switches of each phase is assigned one each Winding U, V or W connected to the engine. The state, open or closed, each switch is by a switching pattern generator 23rd controlled, the one for the current phase φ of the motor shaft reprδ sentative signal from a phase detector 24 receives and based this phase signal, the energization of the Stδnderwicklungen U, V, W of the Motor 9 so determined that the of the stator windings U, V, W in Motor 9 generated a certain advance of the phase magnetic field from which its owner has and drives this.

The phase detector 24 may be replaced by one or more Be formed magnetic field sensors such as Hall sensors, the Magnetic field of the rotor or of rotating coupled with the rotor Magnets are exposed. Preferably, it is a pure electronic phase detector, such as. As described in US-A-5859520, the one zero crossing of the one in a temporarily de-energized Winding U, V or W of the motor through the magnetic field of the rotor bank evaluates the induced electromotive force, in order to derive the phase φ der der Lδufers derive.

The phase signal supplied by the phase detector 24 is also from a Speed measuring circuit 25 receive the speed n of the motor 9th by making a time derivative, measuring the period or Like. Determined.

The speed measuring circuit 25 supplies a detected speed n reprδ sentative signal to a monitoring circuit 26.

A current measuring circuit 27 has two inputs, with the two Terminals of a measuring resistor 28 are connected in Row with the inverter 22 between the output terminals of Mains rectifier 21 is connected. The fliei through the measuring resistor 28 end of current is therefore the sum of the three phases of the Inverter 22 flowing currents.

A voltage measuring circuit 29 has two inputs parallel to the Inverter 22 to the two outputs of the mains rectifier 21st are connected and so capture the value of the intermediate voltage.

Outputs of the three measuring circuits 25, 27, 29 are connected to the α ' monitoring circuit 26, so at any time the current values the speed n, the DC link voltage and the Interrogate DC link current. Based on the amperage and Voltage readings is the α monitoring circuit 26 capable of from the inverter (and thus ultimately from the motor 9) recorded to calculate electrical power. This power is available when the pump 5 properly, in a fixed relationship with the speed n. This relationship is due to the shape of the lines 12, 13 determined by which the Spóllauge is pumped. This Context is in the form of a characteristic curve in a memory of the α ' Monitor circuit 25 stored. By comparing a current one Pair of power and speed with this pre-known characteristic curve For example, the α monitoring circuit 26 is capable of interfering with the interference Lye circulation, for example due to low water level in the Spó lkammer 1 or by blockage of the filter 4, to detect and if necessary, mainframes to protect the motor 9 to meet. Such Mainframes may be e.g. the shutdown of the engine or the entire Spólmaschine, a Róckspólen the filter 4, to solve the blockage, etc. be.

Based on the supplied by the measuring circuits 27, 29 power and Voltage values, the α monitoring circuit 26 is also able to the ohmic resistance of an arrangement of windings of the motor. 9 to investigate. This ohmic resistance is based on a resistance temperature characteristic of the material of the windings U, V, W a Ró close to their temperature.

If a programmer 30, the operation of various Functional components of the Spólmaschine based on a user The selected program controls a value for the temperature of the Spó lwassers requires, he orders a temporary interruption of the operation the pump 5 on. For this purpose, the motor 9 is stopped by the Speed with which output from the generator 23 Switching pattern successive, is reduced, until finally one of arbitrarily chosen orientation of the magnetic field in motor 9 corresponding switching pattern is reached. From this switching pattern is not indexed so that the rotor of the motor 9 in one of the Orientation of the magnetic field in this circuit pattern corresponding Position remains. In this switching pattern, e.g. the switches SU1 and SV2 be open and all others closed, leaving a stream in Row through the windings U, V of the motor flieít, or it can Switches SU1, SV2, SW2 closed and the others open so that Current flows through the winding U and then onto the windings V, W distributed.

After the Lδufer the engine 9 in this shift pattern appropriate position has come to rest, so the current flow is no longer affected by induction by the engine, The α monitoring circuit 26 reads the signals from the measuring circuits 27, 29 recorded values of current and voltage. From the measured Voltage is subtracted a value that corresponds to the voltage drop in cascaded current-carrying switches such as SU1, SV2 of the inverter corresponds, and the difference is obtained with the measured current value is related to an ohmic To obtain resistance value of the current supplied windings. On the basis of a Resistance temperature characteristic, e.g. in one of the α ' monitoring circuit 26 associated semiconductor memory device can be stored, the α 'monitoring circuit 26 determines the measured resistance value corresponding temperature Winding arrangement.

In principle, it is possible to use all of the above-mentioned components 23 to 30, possibly with the exception of the measuring resistor 28, in a common Implement microcontroller. In the illustration of FIG. 2 includes a symbolized as a dashed frame microcontroller 31 the Components 23 to 27 and 29; the programmer 30, not only the pump 5, but also removed from her components such as the Heating rod 8 and inlet and outlet valves for the supply and discharge of Water in and out of the Spólkammer controls and commands a user processed is spatially separated from the microcontroller 31.

To regulate the temperature of the Spóllauge on the basis of Resistance value of the winding arrangement or derived therefrom Allow temperature to wind, the windings U, V, W in tight thermal contact with the Spóllauge stand. Fig. 3 shows in one Section one embodiment of a unit of pump 5, motor 9 and Control electronics that meet this requirement particularly well.

The pump 5 is a Flógelpumpe with a housing from a front Housing shell 41 and a pot-shaped indented shield 42, the limit a one-piece pump chamber 40. In the pump chamber 40 is a Flógelrad 43 and, in the potff Einbmmiges indentation of the shield 42nd intervening, a bank 44 of the brushless DC motor 9 accommodated. The Lδufer 44 is in the pumped by the pump Fló dipped and cooled by this liquid. The essentially ringfφ ohms 45 of the motor 9, which includes the windings U, V, W, is mounted on the edge of a housing shell 46, in which a circuit board 47 is anchored, trδgt the microcontroller 31 and the measuring resistor 28. The assembly of Gehasuseschale 46 and Stδnder 45 is in the manner of a Bechers outside over the sign 42 gestólpt. The windings U, V, W are here only through the wall of the pot-shaped indentation of the shield 42 separated from the Spóllauge, which in the pump chamber 40 also the bank 44 umspólt. Since the liquor in the pump chamber 40 standig their temperature is a good average for the Temperature of the liquor in the Spöllkammer 1.

Due to the close spatial proximity the temperature is the Stδ Windings closely coupled to the Spóllauge. In the simplest case the temperature of the windings is equated with that of the Spóllauge.

A systematic deviation between the temperature of the Spóllauge and that of the stub windings can on in the stub windings in the Operation of the engine generated Joule heat back to. one according to a further developed embodiment, the α 'takes into account monitoring circuit this effect by continuously using measured or interpolated resistance values R the Joule Performance gemδí

P = RI 2 or P = 1 R U 2
determined and the temperature increase .DELTA.T according to .DELTA.T =

Figure 00080001
where t 0 is the switch-on point of the dishwasher,
t the present time
n the heat capacity of the stator in JK -1 and
α denotes the time required to let a temperature difference between stand and liquor decay to 1 / e.

If ΔT is taken from the resistance measurement Temperature value of the stator from, is a to the influence of the Joule Heat adjusted temperature value obtained, the temperature of the Lye exactly reproduces.

Claims (9)

  1. Electric household appliance having a chamber (1) at least partially filled with liquid during operation of the appliance, a pump (5) for circulating the liquid and a motor (9) driving the pump (5) which is in thermal contact with the liquid Winding arrangement (U, V, W), characterized in that the winding arrangement (U, V, W) is associated with a measuring circuit (24-29) for detecting the electrical resistance value of the winding arrangement.
  2. Electric household appliance according to claim 1, characterized by a heating device (8) for heating the liquid and a control device (30) for controlling the operation of the heating device on the basis of the detected resistance value.
  3. Domestic appliance according to claim 1 or 2, characterized in that the motor (9) has a rotor (44) arranged in a chamber (40) of the pump (5) filled with the liquid.
  4. Domestic appliance according to claim 3, characterized in that the winding arrangement (U, V, W), which is associated with the measuring circuit (24-29), part of a stator (45) of the motor (9).
  5. Domestic appliance according to claim 4, characterized in that a wall of the chamber (40) of the pump (5) extends in an air gap between the rotor (44) and stator (45).
  6. Domestic electrical appliance according to one of the preceding claims, characterized in that the winding arrangement (U, V, W) comprises the entirety of the windings of the motor or two windings connected in series.
  7. Electric household appliance according to one of the preceding claims, characterized in that the measuring circuit (24-29) is adapted to perform a measurement of the resistance of the winding each with the engine stopped.
  8. Electric household appliance according to one of the preceding claims,
    characterized in that the motor (9) is powered by an inverter (22), and that the measuring circuit (24-29) comprises a current measuring circuit (27) for measuring the current flow through the inverter (22).
  9. Electric household appliance according to one of the preceding claims, characterized in that the motor (9) via an inverter (22) is fed, and that the measuring circuit (24-29) comprises a voltage measuring circuit (29) for measuring the input voltage of the inverter (22) ,
EP05100684A 2004-02-13 2005-02-01 Electric household appliance utilising a liquid Withdrawn EP1566477A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200410007246 DE102004007246A1 (en) 2004-02-13 2004-02-13 Liquid household electrical appliance
DE102004007246 2004-02-13

Publications (1)

Publication Number Publication Date
EP1566477A1 true EP1566477A1 (en) 2005-08-24

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ID=34706819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05100684A Withdrawn EP1566477A1 (en) 2004-02-13 2005-02-01 Electric household appliance utilising a liquid

Country Status (2)

Country Link
EP (1) EP1566477A1 (en)
DE (1) DE102004007246A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1762169A2 (en) * 2005-09-09 2007-03-14 BSH Bosch und Siemens Hausgeräte GmbH Household apparatus with water circulation with a pump.
CN1702334B (en) * 2004-05-12 2011-11-23 阿斯科尔控股有限公司 Fluid circulation pump with synchronous motor, equipped with heating means of the fluid, in particular for washing machines
DE102014206119A1 (en) 2013-12-18 2015-06-18 BSH Hausgeräte GmbH Method for operating a pump in a household appliance and water-conducting household appliance
EP2954828A1 (en) * 2014-06-12 2015-12-16 LG Electronics Inc. Dishwasher and control method for the same
EP2954829A1 (en) * 2014-06-12 2015-12-16 LG Electronics Inc. A control method of a dish washer
CN106367912A (en) * 2015-07-22 2017-02-01 东芝生活电器株式会社 Drum washing machine
DE102017211569A1 (en) 2017-07-06 2019-01-10 BSH Hausgeräte GmbH Method for operating a washing machine with improved pumping operation in two-phase fluids and washing machine suitable for this purpose
DE102017211573A1 (en) 2017-07-06 2019-01-10 BSH Hausgeräte GmbH Method for operating a washing machine with improved pump state detection and suitable washing machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2938883A1 (en) * 1979-09-26 1981-04-09 Bosch Siemens Hausgeraete Water heater for domestic dishwasher - uses resistance heating element associated with pump motor housing projecting into washer compartment
US5158436A (en) * 1990-03-29 1992-10-27 Grundfos International A/S Pump with speed controller responsive to temperature
JPH06323295A (en) * 1993-05-17 1994-11-22 Chiyoda Corp Method for cooling down and hotting up pump for low temperature liquid
DE10142525A1 (en) * 2001-08-30 2003-03-27 Miele & Cie Rinse water circulation pump of dishwashing machine has contained heating element and safety protector to raise temperature of rinse water

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2938883A1 (en) * 1979-09-26 1981-04-09 Bosch Siemens Hausgeraete Water heater for domestic dishwasher - uses resistance heating element associated with pump motor housing projecting into washer compartment
US5158436A (en) * 1990-03-29 1992-10-27 Grundfos International A/S Pump with speed controller responsive to temperature
JPH06323295A (en) * 1993-05-17 1994-11-22 Chiyoda Corp Method for cooling down and hotting up pump for low temperature liquid
DE10142525A1 (en) * 2001-08-30 2003-03-27 Miele & Cie Rinse water circulation pump of dishwashing machine has contained heating element and safety protector to raise temperature of rinse water

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 02 31 March 1995 (1995-03-31) *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1702334B (en) * 2004-05-12 2011-11-23 阿斯科尔控股有限公司 Fluid circulation pump with synchronous motor, equipped with heating means of the fluid, in particular for washing machines
EP1762169A2 (en) * 2005-09-09 2007-03-14 BSH Bosch und Siemens Hausgeräte GmbH Household apparatus with water circulation with a pump.
EP1762169A3 (en) * 2005-09-09 2008-08-06 BSH Bosch und Siemens Hausgeräte GmbH Household apparatus with water circulation with a pump
DE102014206119A1 (en) 2013-12-18 2015-06-18 BSH Hausgeräte GmbH Method for operating a pump in a household appliance and water-conducting household appliance
DE102014206119B4 (en) * 2013-12-18 2016-09-22 BSH Hausgeräte GmbH Method for operating a pump in a household appliance and water-conducting household appliance
EP2954829A1 (en) * 2014-06-12 2015-12-16 LG Electronics Inc. A control method of a dish washer
CN105167728A (en) * 2014-06-12 2015-12-23 Lg电子株式会社 Dishwasher and control method for the same
CN105286744A (en) * 2014-06-12 2016-02-03 Lg电子株式会社 Dishwasher and control method thereof
AU2015203124B2 (en) * 2014-06-12 2016-09-15 Lg Electronics Inc. Dishwasher and Control Method for the Same
EP2954828A1 (en) * 2014-06-12 2015-12-16 LG Electronics Inc. Dishwasher and control method for the same
CN105167728B (en) * 2014-06-12 2019-01-29 Lg电子株式会社 The control method of dish-washing machine and dish-washing machine
AU2015203138B2 (en) * 2014-06-12 2017-05-18 Lg Electronics, Inc. Dishwasher and Control Method Thereof
US9839944B2 (en) 2014-06-12 2017-12-12 Lg Electronics Inc. Dishwasher and control method thereof
US9844801B2 (en) 2014-06-12 2017-12-19 Lg Electronics Inc. Dishwasher
CN106367912A (en) * 2015-07-22 2017-02-01 东芝生活电器株式会社 Drum washing machine
CN106367912B (en) * 2015-07-22 2019-04-05 东芝生活电器株式会社 Tumbling-box washing machine
DE102017211569A1 (en) 2017-07-06 2019-01-10 BSH Hausgeräte GmbH Method for operating a washing machine with improved pumping operation in two-phase fluids and washing machine suitable for this purpose
DE102017211573A1 (en) 2017-07-06 2019-01-10 BSH Hausgeräte GmbH Method for operating a washing machine with improved pump state detection and suitable washing machine

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