EP1711099B1 - Flüssigkeitsführendes elektrisches haushaltsgerät - Google Patents

Flüssigkeitsführendes elektrisches haushaltsgerät Download PDF

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Publication number
EP1711099B1
EP1711099B1 EP05701571A EP05701571A EP1711099B1 EP 1711099 B1 EP1711099 B1 EP 1711099B1 EP 05701571 A EP05701571 A EP 05701571A EP 05701571 A EP05701571 A EP 05701571A EP 1711099 B1 EP1711099 B1 EP 1711099B1
Authority
EP
European Patent Office
Prior art keywords
domestic appliance
rotational speed
motor
detected
pump
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.)
Expired - Lifetime
Application number
EP05701571A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1711099A1 (de
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 Hausgeraete 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
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Application filed by BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Priority to PL05701571T priority Critical patent/PL1711099T3/pl
Publication of EP1711099A1 publication Critical patent/EP1711099A1/de
Application granted granted Critical
Publication of EP1711099B1 publication Critical patent/EP1711099B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0049—Detection or prevention of malfunction, including accident prevention
    • 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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4202—Water filter means or strainers
    • A47L15/4208—Arrangements to prevent clogging of the filters, e.g. self-cleaning
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/08—Drain or recirculation pump parameters, e.g. pump rotational speed or current absorbed by the motor
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/20—Time, e.g. elapsed operating time
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output 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
    • A47L2501/01—Water supply, e.g. opening or closure of the water inlet valve
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output 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
    • A47L2501/26—Indication or alarm to the controlling device or to the user
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output 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
    • A47L2501/32—Stopping or disabling machine operation, including disconnecting the machine from a network, e.g. from an electrical power supply
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2501/00—Output 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
    • A47L2501/36—Other output
    • 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
    • D06F2103/44—Current or voltage
    • D06F2103/48—Current or voltage of the motor driving the 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
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/52—Changing sequence of operational steps; Carrying out additional operational steps; Modifying operational steps, e.g. by extending duration of steps
    • 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 
    • D06F33/47—Responding to irregular working conditions, e.g. malfunctioning of 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
    • 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 present invention relates to a household electrical appliance having a chamber at least partially filled with liquid during operation of the apparatus and a pump driven by a motor for drawing liquid from the chamber.
  • a household appliance may be a dishwasher or washing machine
  • the pump is a drain pump which draws cleaning liquor from a lower part of the chamber to spray it on to be cleaned in the chamber, or to pump it out of the chamber
  • Such a dishwasher is eg from JP 06 014862 A known.
  • a flow meter is installed in an inlet line of the chamber, which monitors the amount of fresh water introduced and causes the blocking of a valve in the inlet line when a designated amount of water is reached.
  • a flowmeter is not only costly, it is also not able to adjust the amount of water taken in each case to the degree of contamination of the machine to be cleaned with the goods. For example, if a dishwasher is loaded with heavily soiled dishes, so contained in the dirt proteins lead to a strong foam formation of the rinse liquor, with the result that not only rinsing liquor, but also foam is sucked by the pump.
  • the foam prevents the build-up of a sufficiently high pressure at the pump outlet and thus a satisfactory cleaning effect. Foaming may be counteracted by ingesting a larger amount of water, but this, when done during each cleaning operation, is uneconomical, as stated above. Conventional dishwashers therefore often have program buttons, the allow a user, depending on the degree of contamination of the invited dishes to select different washing programs with different water use. Since the assessment of the degree of contamination by the user to some extent is subjective and the use of the appropriate selection key is also easily forgotten, optimal profitability can not be guaranteed.
  • the cleaning solution may cause blockage of the pump or its upstream or downstream lines blocking the movement of the pump and thus of the motor. Since in such a case, the engine does not perform any mechanical work, the entire - under such circumstances may even increased compared to the normal operation - absorbed by him electrical power is converted into heat, which may cause damage or even destruction of the engine.
  • a flow meter connected in series with the pump of the type mentioned above, such a sensor is, as stated, expensive and blocks valuable space in the household appliance.
  • the object of the invention is to provide an electrical household appliance of the type defined, which allows the detection of disturbances of the liquid flow through the pump with simple, inexpensive and reliable means.
  • the home appliance includes a monitor for detecting the speed and power of the motor, comparing detected values of speed and power with a predetermined characteristic, and for signaling a state of exception when the comparison reveals that the detected values deviate significantly from the characteristic.
  • the home appliance includes an inlet valve for introducing liquid into the chamber and a controller configured to open the inlet valve when the monitor signals a first exception in which the sensed speed is significantly less than one for that Speed based on the characteristic expected power value.
  • the household appliance may have a plurality of Umisselzdorf, over which the circulated by the pump liquid is selectively feasible, as described in Wegner, Household Appliances / Technology and Service, Publisher Wegig & Pflaum, 2000, for a dishwasher. Since such different Umisselzwege usually have different flow resistance, the monitoring device is advantageously set up, depending on the selected Umisselzweg a specific for each selected Umisselzweg characteristic comparison.
  • a first characteristic based on the assumption that at this time a deviation from the characteristic indicates that the pump sucks in air due to insufficient amount of liquor.
  • a different characteristic of power and rotational speed can be used to detect the foaming.
  • the control device stops the operation of the household appliance to protect the engine, or that it outputs a warning signal to prompt a user to take countermeasures to protect the engine.
  • a synchronous motor is used as the engine in the household appliance according to the invention.
  • a motor allows comparatively simple detection of its speed solely by monitoring the time course of the electromotive force in the windings of the motor, i. the currents or voltages occurring at the motor, so that costly and space-consuming sensors on the engine or the pump to determine the speed are not required.
  • the rotor of the motor is arranged in a pump chamber of the pump.
  • a runner also referred to as a wet runner, makes it possible to dispense with a seal on the shaft between the rotor and the pump, at which friction losses in strength which can not be precisely controlled could occur.
  • This design of the rotor therefore allows a particularly accurate inference of the electrical power absorbed by the engine to the mechanical power delivered by the pump.
  • Fig. 1 a schematic section through a dishwasher according to the invention
  • Fig. 2 a block diagram of the motor of the circulation pump of the dishwasher Fig. 1 as well as its supply electronics;
  • Fig. 4 a section through an assembly in which the pump, the engine 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 are guided out on rails pulled out arranged.
  • a rinsing water filter 4 In a recess at the bottom of the rinsing chamber 1 is a rinsing water filter 4 through the one later with respect to Fig. 2
  • pump 5 sucks rinse water to feed rotatably mounted nozzle arms 6, 7, which are each mounted below the baskets 2, 3, to spray the items contained therein.
  • a directional control valve 8, which is mounted between the outlet of the pump 5 and the nozzle arm 6 or 7, is controlled by a microcontroller 31 (see FIG. Fig. 2 ) between the position shown in the figure, in which the lower nozzle arm 7 is supplied via a line 13 with rinse water, and a position switchable periodically, in which the upper nozzle arm 6 is supplied via a line 12.
  • valve 8 could also be omitted, so that both nozzle arms 6, 7 are supplied simultaneously. In this case, however, during operation of the nozzle arms 6, 7, both lines 12, 13 must be filled with water at the same time, so that the total amount of water required for rinsing is greater than during alternating operation of the spray arms 6, 7 with the aid of the valve 8.
  • An inlet valve 10, which is likewise controlled by the microcontroller 31, serves for the controlled admission of fresh water into the rinsing chamber via a fresh water line 11.
  • the pump 5 is driven by a brushless DC motor 9, which is powered by a supply electronics block 20 with electrical energy.
  • the motor 9 and the supply electronics block 20 are in Fig. 2 shown in more detail in a block diagram.
  • the motor 9 has three stator windings, designated U, V, W, which are interconnected here in a stem configuration.
  • the supply electronics block 20 comprises a mains rectifier 21, which supplies an intermediate DC voltage. This intermediate DC voltage feeds three phases of an inverter 22, each comprising two series-connected switches SU1, SU2 and SV1, SV2 and SW1, SW2, each in the form of a power transistor with a parallel freewheeling diode. The point between two switches of each phase is connected to the associated winding U, V or W of the motor.
  • each switch is controlled by a switching pattern generator 23, which receives a signal representative of the instantaneous phase ⁇ of the motor shaft from a phase detector 24 and, based on this phase signal, the energization of the stator windings U, V, W of the motor 9 so determines that the magnetic field generated by the stator windings U, V, W in the motor 9 has a certain projection before the phase of the rotor and this drives.
  • the phase detector 24 may be formed by one or more magnetic field sensors, such as Hall sensors, which are exposed to the magnetic field of the rotor or of magnets coupled to the rotor.
  • it is a purely electronic phase detector, such as in US-A-5859520 described, which evaluates a zero crossing of the induced in a temporarily de-energized winding U, V or W of the motor by the magnetic field of the rotor electromotive force to derive therefrom the phase ö of the rotor.
  • the phase signal supplied from the phase detector 24 is also received by a speed measuring circuit 25 which determines the rotational speed n of the motor 9 therefrom by taking a time derivative, measuring the period or the like.
  • the speed measuring circuit 25 supplies a signal representative of the detected speed n to a monitoring circuit 26.
  • a current measuring circuit 27 has two inputs, which are connected to the two terminals of a measuring resistor 28 which is connected in series with the inverter 22 between the output terminals of the mains rectifier 21.
  • the current flowing through the measuring resistor 28 is therefore the sum of the currents flowing through the three phases of the inverter 22 and is thus - assuming a constant intermediate circuit voltage at the output of the rectifier 21 - proportional to the electrical power absorbed by the motor 9. Accordingly, the voltage difference between the two input terminals of the current measuring circuit 27 is proportional to the received electric power.
  • the current measuring circuit 27 supplies a digital signal representative of this power to the monitoring circuit 26.
  • a plurality of speed-power characteristics are stored, each describing a relationship between speed n and absorbed electric power P corresponding to normal operation. These characteristics, which depend in particular on the shape and passage cross-section of the paths over which the rinse water is pumped, have been determined in advance on a prototype of the dishwasher.
  • Fig. 3 shows two such characteristics, denoted by C1 and C2, where C2 corresponds to a higher flow resistance than C1, as occurs approximately in the operation of the upper spray arm 6, because the head to be overcome is greater than in the case of the lower spray arm 7.
  • the monitoring circuit 26 selects each one of the current position of the directional control valve 8 associated characteristic, for. B. at the in Fig.
  • the characteristic C1 reads the according to this characteristic C1 corresponding to a current speed supplied by the speed measurement circuit 25 theoretical power value from the read-only memory 29 and compares this with a calculated using a simultaneously supplied by the current measuring circuit current value 27 current performance. If the current power value deviates by more than an allowable amount from the theoretical power value, the monitoring circuit 26 generates a fault message, which is output to a programmer 30 and which specifies the direction of the deviation.
  • the pump 5 sucks not only water, but also foam or air. If this condition is detected at the first start of the pump 5 after the introduction of water at the beginning of a rinse, this is due to the fact that the amount of water in the rinsing chamber 1 is not evasive.
  • the programmer 30 then opens the inlet valve 10 to admit fresh water into the wash chamber 1 until the monitor circuit 26 stops reporting the disturbance or until a predetermined amount of time has elapsed.
  • the programmer 30 locks the inlet valve 10 and stops the flushing operation to preclude the flushing chamber 1 from being overfilled with water due to a detection error. At the same time, the programmer 30 activates an indicator light (not shown) on the housing of the dishwasher to alert a user of the failure.
  • the programmer 30 also opens the inlet valve 10, but only for a predetermined short time. Thereafter, the purging operation may continue, with the programmer 30 then ignoring the fault message for a predetermined period of time to allow the foam in operation to dissipate, or the operation of the machine is interrupted for a few minutes to allow the foam to dissolve.
  • the programmer 30 aborts the flushing process and indicates by means of a signal light on the device housing on the unscheduled termination of the wash program. If the filter 4 is of the self-cleaning type, pumping out the rinse water after the program termination may already be sufficient to clean the filter 4, so that a user only needs to restart the machine. Otherwise, it must clean the filter 4 itself before restarting the machine.
  • FIG. 4 A preferred embodiment of an assembly, in which the microcontroller 31, the motor 9 and the pump 5 are combined, is in Fig. 4 shown in section.
  • the pump 5 is a vane pump with a housing of a front housing shell 41 and a pot-shaped plate 42 which define a one-piece pump chamber.
  • the rotor 44 is immersed in and cooled by the liquid pumped by the pump.
  • the stator 45 of the motor 9 is mounted on a housing shell 46, in which a circuit board 47 is anchored, which carries the microcontroller 31 and the measuring resistor 28.
  • the assembly of housing shell 46 and stand 45 is slipped outside over the plate 42 in the manner of a cup.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Food-Manufacturing Devices (AREA)
  • Apparatus For Making Beverages (AREA)
  • Cookers (AREA)
  • Brushes (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP05701571A 2004-01-23 2005-01-20 Flüssigkeitsführendes elektrisches haushaltsgerät Expired - Lifetime EP1711099B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05701571T PL1711099T3 (pl) 2004-01-23 2005-01-20 Elektryczne urządzenie gospodarstwa domowego z prowadzeniem cieczy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004003536A DE102004003536A1 (de) 2004-01-23 2004-01-23 Flüssigkeitsführendes elektrisches Haushaltsgerät
PCT/EP2005/050239 WO2005070275A1 (de) 2004-01-23 2005-01-20 Flüssigkeitsführendes elektrisches haushaltsgerät

Publications (2)

Publication Number Publication Date
EP1711099A1 EP1711099A1 (de) 2006-10-18
EP1711099B1 true EP1711099B1 (de) 2009-05-20

Family

ID=34745041

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05701571A Expired - Lifetime EP1711099B1 (de) 2004-01-23 2005-01-20 Flüssigkeitsführendes elektrisches haushaltsgerät

Country Status (8)

Country Link
US (1) US8439052B2 (pl)
EP (1) EP1711099B1 (pl)
CN (1) CN100584264C (pl)
AT (1) ATE431717T1 (pl)
DE (2) DE102004003536A1 (pl)
ES (1) ES2325929T3 (pl)
PL (1) PL1711099T3 (pl)
WO (1) WO2005070275A1 (pl)

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DE502005007314D1 (de) 2009-07-02
ES2325929T3 (es) 2009-09-24
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US20070163626A1 (en) 2007-07-19
EP1711099A1 (de) 2006-10-18
ATE431717T1 (de) 2009-06-15
CN1909822A (zh) 2007-02-07
PL1711099T3 (pl) 2009-10-30
CN100584264C (zh) 2010-01-27
US8439052B2 (en) 2013-05-14

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