DE102004007246A1 - Liquid household electrical appliance - Google Patents

Liquid household electrical appliance

Info

Publication number
DE102004007246A1
DE102004007246A1 DE200410007246 DE102004007246A DE102004007246A1 DE 102004007246 A1 DE102004007246 A1 DE 102004007246A1 DE 200410007246 DE200410007246 DE 200410007246 DE 102004007246 A DE102004007246 A DE 102004007246A DE 102004007246 A1 DE102004007246 A1 DE 102004007246A1
Authority
DE
Germany
Prior art keywords
characterized
motor
pump
liquid
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Withdrawn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
DE200410007246
Other languages
German (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 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
Application filed by BSH Bosch und Siemens Hausgaraete GmbH filed Critical BSH Bosch und Siemens Hausgaraete GmbH
Priority to DE200410007246 priority Critical patent/DE102004007246A1/en
Publication of DE102004007246A1 publication Critical patent/DE102004007246A1/en
Withdrawn legal-status Critical Current

Links

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.

Description

  • The The present invention relates to a household electrical appliance having a during operation of the device at least partly with liquid filled Chamber and a driven by a motor pump for circulating the Liquid. In such a household appliance It can be in particular a dishwasher or washing machine act, and at the pump to a drain pump, the cleaning liquor from 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.
  • The Cleaning liquor in such a household appliance must be on a predetermined Operating temperature to be maintained. For detecting the temperature is generally a temperature sensor such as a thermocouple in as possible placed in close thermal contact with the cleaning liquor. The installation Such a sensor requires costs and labor.
  • Around To save on parts costs and assembly costs, it would be desirable to have a household appliance to dispose of in which for detecting the temperature of the cleaning liquor or a other things in the device circulating liquid such a temperature sensor is not required.
  • The Task is solved through a household appliance with the features of claim 1.
  • The Invention takes advantage of the fact that the windings of a pump the liquid used pump motor frequently are in thermal contact with the liquid-carrying parts, so that their temperature is close to that of the liquid follows, and that most for the preparation of the winding suitable materials a temperature-dependent specific Have resistance, so from fluctuations in the resistance value the windings a conclusion to the temperature of the windings is possible, in turn with that of the liquid tight is correlated. From the development of the electrical resistance value The winding arrangement is therefore a conclusion on the temperature the liquid possible.
  • in the General features a household appliance of above type above a heater for heating the liquid and a controller for controlling the operation of the heater. This can conveniently the detected resistance value for use the temperature control.
  • Preferably the motor of the pump of the machine according to the invention has a wet rotor, i. H. the runner is in one with the liquid filled chamber housed, which forms part of the pump. This construction ensures a close thermal coupling of both the rotor and the chamber surrounding stand of the engine to the liquid.
  • The Winding arrangement whose resistance is measured can be a single Winding, the entirety of the windings of the motor or one between These two extremes include the number of windings. in the Fall 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.
  • Around an impairment the accuracy of the resistance measurement by induction in the motor to avoid leads the measuring circuit, the resistance measurement preferably at a standstill Engine off.
  • If the engine over an inverter is supplied, are for detecting the resistance value the winding arrangement preferably a current measuring circuit for Measuring the current flow through the inverter and / or a voltage measuring circuit provided for measuring the input voltage of the inverter, from their measurement results, the resistance value under consideration of the voltage drop in the inverter can be calculated.
  • Further Features and advantages of the invention will become apparent from the following Description of exemplary embodiments with reference to the attached Characters. Show it:
  • 1 a schematic section through a dishwasher according to the invention;
  • 2 a block diagram of the motor of the circulation pump of the dishwasher 1 as well as its supply electronics;
  • 3 a section through an assembly in which the pump, the motor and the power electronics are summarized.
  • 1 shows a schematic section through a dishwasher with a rinsing chamber 1 , in the usual way baskets 2 . 3 guided on rails are pulled out. In a depression at the bottom of the rinsing chamber 1 there is a flushing water filter 4 through which a later Be train 2 and 3 more precisely explained pump 5 Rinsing liquor sucks to order via lines 12 . 13 rotatably mounted nozzle arms 6 . 7 to dine, respectively, under the baskets 2 . 3 are mounted to spray the items contained therein. An electric heating rod 8th is at the bottom of the washing chamber 1 mounted and used to heat the rinse liquor.
  • The pump 5 is from a brushless DC motor 9 driven.
  • An electronics block for driving the motor 9 and the heating rod 8th according to a user selected washing program is in 1 in summary with 20 designated. 2 shows in more detail in the form of a block diagram the structure of the electronic block 20 , The motor 9 has three stator windings, labeled U, V, W, which are interconnected here in a star configuration. The supply electronics block 20 includes a power rectifier 21 which provides an intermediate DC voltage. This DC intermediate voltage feeds three phases of an inverter 22 each of which comprises two series-connected switches SU1, SU2 and SV1, SV2 and SW1, SW2, each in the form of a parallel-freewheeling diode power transistor. The point between two switches of each phase is connected to an associated winding U, V or W of the motor. The state, open or closed, of each switch is through a switching pattern generator 23 which is a representative of the instantaneous phase φ of the motor shaft signal from a phase detector 24 receives and, based on this phase signal, the energization of the stator windings U, V, W of the motor 9 so that determines that of the stator windings U, V, W in the engine 9 generated magnetic field has a certain advantage over the phase of the rotor and drives this.
  • 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. Preferably, it is a purely electronic phase detector, such. Example, in US-A-5859520, 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 φ of the rotor.
  • That of the phase detector 24 supplied phase signal is also from a speed measuring circuit 25 received, which is the speed n of the engine 9 determined therefrom by forming a time derivative, measuring the period or the like.
  • The speed measuring circuit 25 provides a representative of the detected speed n signal to a monitoring circuit 26 ,
  • A current measuring circuit 27 has two inputs connected to the two terminals of a measuring resistor 28 connected in series with the inverter 22 between the output terminals of the mains rectifier 21 is switched. The through the measuring resistor 28 flowing current is therefore the sum of the three phases of the inverter 22 flowing streams.
  • A voltage measuring circuit 29 has two inputs that are parallel to the inverter 22 to the two outputs of the mains rectifier 21 are connected and so capture the value of the intermediate voltage.
  • Outputs of the three measuring circuits 25 . 27 . 29 are with the monitoring circuit 26 connected so that at any time the current values of the speed n, the DC link voltage and the DC link current can query. Based on the current and voltage measurements is the monitoring circuit 26 capable of removing the power from the inverter (and ultimately from the motor 9 ) to calculate absorbed electric power. This power is available when the pump 5 is running properly, in a fixed relationship with the speed n. This connection is due to the shape of the lines 12 . 13 set, through which the flushing eye is pumped. This relationship is in the form of a characteristic curve in a memory of the monitoring circuit 25 stored.
  • By comparing a current pair of power and speed with this pre-known characteristic curve, the monitoring circuit is 26 capable of disturbing the lye circulation, for example due to low water level in the rinsing chamber 1 or by clogging the filter 4 , capture and, where appropriate, measures to protect the engine 9 hold true. Such measures may include the shutdown of the engine or the entire dishwasher, a backwash the filter 4 to solve the constipation, etc.
  • On the basis of the measuring circuits 27 . 29 supplied current and voltage values is the monitoring circuit 26 further capable of resisting an arrangement of windings of the motor 9 to investigate. This ohmic resistance can be based on a resistance temperature characteristic of the material of the windings U, V, W to draw a conclusion on the temperature thereof.
  • If a programmer 30 , which controls the operation of various functional components of the dishwasher on the basis of a user-selected wash program, a value for the temperature of the rinse water, it orders a temporary interruption of the operation of the pump 5 at. This is the engine 9 stopped by the speed with which the generator 23 output circuit pattern is reduced, until finally one of an arbitrary orientation of the magnetic field in the motor 9 corresponding switching pattern is reached. From this switching pattern is not incremented, so that the rotor of the motor 9 remains in a position corresponding to the orientation of the magnetic field in this switching pattern. In this switching pattern, for example, the switches SU1 and SV2 may be open and all others closed so that a current flows in series through the windings U, V of the motor, or the switches SU1, SV2, SW2 may be closed and the others open, so that current flows through the winding U and then distributed to the windings V, W.
  • After the runner of the engine 9 in the position corresponding to this switching pattern has come to rest, so that the current flow through the motor is no longer affected by induction phenomena, reads the monitoring circuit 26 that of the measuring circuits 27 . 29 recorded values of current and voltage. From the measured voltage, a value corresponding to the voltage drop in cascaded current-passing switches such as SU1, SV2 of the inverter is subtracted, and the obtained difference is related to the measured current to obtain an ohmic resistance of the energized windings. Based on a resistance temperature characteristic, for example, in one of the monitoring circuit 26 assigned semiconductor memory module may be stored, determines the monitoring circuit 26 the temperature of the winding arrangement corresponding to the measured resistance value.
  • In principle, it is possible to use all the components mentioned above 23 to 30 , possibly with the exception of the measuring resistor 28 to implement in a common microcontroller. In the presentation of the 2 includes a symbolized as a dashed frame microcontroller 31 the components 23 to 27 and 29 ; the program automat 30 that's not just the pump 5 but also components removed from it, such as the heating element 8th as well as controls inlet and outlet valves for the supply and discharge of water in and out of the rinsing chamber and processes commands of a user is of the microcontroller 31 spatially separated.
  • In order to enable a regulation of the temperature of the flushing liquor on the basis of the resistance value of the winding arrangement or the temperature derived therefrom, the windings U, V, W must be in close thermal contact with the flushing liquor. 3 shows in a section an embodiment of a unit of pump 5 , Engine 9 and control electronics that meets this requirement particularly well.
  • The pump 5 is a vane pump with a housing of a front housing shell 41 and a pot-shaped indented shield 42 , which is a one-piece pumping chamber 40 limit. In the pump chamber 40 is an impeller 43 and, in the cup-shaped indentation of the shield 42 engaging, a runner 44 of the brushless DC motor 9 accommodated. The runner 44 is immersed in the liquid pumped by the pump and cooled by it. The essentially annular stand 45 of the motor 9 , which includes the windings U, V, W, is at the edge of a housing shell 46 mounted, in which also a board 47 is anchored to the microcontroller 31 and the measuring resistor 28 wearing. The assembly of housing shell 46 and stand 45 is in the manner of a mug outside on the sign 42 slipped. The windings U, V, W are here only through the wall of the cup-shaped indentation of the shield 42 separated from the rinse liquor, which in the pump chamber 40 also the runner 44 lapped. Since the lye in the pump chamber 40 is constantly exchanged, their temperature is a good average for the temperature of the liquor in the washing chamber 1 ,
  • As a result the narrow spatial Neighborhood is the temperature of the stator windings close to those of the soapy water coupled. In the simplest case, the temperature of the windings equated with the rinse liquor.
  • A systematic deviation between the temperature of the rinsing eye and that of the stator windings may be due to Joule heat generated in the stator windings during operation of the motor. According to a further developed embodiment, the monitoring circuit takes this effect into account by using Joule power in accordance with continuously measured or interpolated resistance values R.
    Figure 00070001
    determined and the resulting temperature increase .DELTA.T according to
    Figure 00070002
    calculated, where
  • t 0
    the switch-on point of the dishwasher,
    t
    the current time
    n
    the heat capacity of the stator in JK -1 and
    α
    refers to the time required to let a temperature difference between stand and liquor decay to 1 / e.
  • attracts one ΔT from based on the resistance measurement temperature value of the stator, becomes a temperature value adjusted for the influence of Joule heat obtained, which accurately reflects the temperature of the liquor.

Claims (9)

  1. Electric household appliance with a chamber at least partially filled with liquid during operation of the appliance ( 1 ), a pump ( 5 ) to circulate the liquid and a pump ( 5 ) driving engine ( 9 ), which has a winding arrangement (U, V, W) in thermal contact with the liquid, characterized in that the winding arrangement (U, V, W) has a measuring circuit ( 24 - 29 ) is assigned for detecting the electrical resistance value of the winding arrangement.
  2. Domestic appliance according to claim 1, characterized by a heating device ( 8th ) for heating the liquid and a control device ( 30 ) for controlling the operation of the heater based on the detected resistance value.
  3. Domestic appliance according to claim 1 or 2, characterized in that the motor ( 9 ) one in a chamber filled with the liquid ( 40 ) of the pump ( 5 ) arranged runners ( 44 ) having.
  4. Domestic electrical appliance according to claim 3, characterized in that the winding arrangement (U, V, W), the measuring circuit ( 24 - 29 ), part of a stand ( 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 ) in an air gap between runners ( 44 ) and stands ( 45 ).
  6. Electric household appliance according to one of the preceding Claims, characterized in that the winding arrangement (U, V, W) the Whole of windings of the motor or two connected in series Windings includes.
  7. Domestic appliance according to one of the preceding claims, characterized in that the measuring circuit ( 24 - 29 ) is arranged to perform a measurement of the resistance of the winding each with the engine stopped.
  8. Domestic electrical appliance according to one of the preceding claims, characterized in that the motor ( 9 ) via an inverter ( 22 ) and that the measuring circuit ( 24 - 29 ) a current measuring circuit ( 27 ) for measuring the current flow through the inverter ( 22 ).
  9. Domestic electrical appliance according to one of the preceding claims, characterized in that the motor ( 9 ) via an inverter ( 22 ) and that the measuring circuit ( 24 - 29 ) a voltage measuring circuit ( 29 ) for measuring the input voltage of the inverter ( 22 ).
DE200410007246 2004-02-13 2004-02-13 Liquid household electrical appliance Withdrawn DE102004007246A1 (en)

Priority Applications (1)

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

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200410007246 DE102004007246A1 (en) 2004-02-13 2004-02-13 Liquid household electrical appliance
EP05100684A EP1566477A1 (en) 2004-02-13 2005-02-01 Electric household appliance utilising a liquid

Publications (1)

Publication Number Publication Date
DE102004007246A1 true DE102004007246A1 (en) 2005-09-01

Family

ID=34706819

Family Applications (1)

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

Country Status (2)

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

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1595489B1 (en) * 2004-05-12 2007-07-11 Askoll Holding S.r.l. Fluid circulation pump with synchronous motor, equipped with heating means of the fluid, in particular for washing-machines
DE102005043026A1 (en) * 2005-09-09 2007-03-15 BSH Bosch und Siemens Hausgeräte GmbH Water-bearing household appliance with a pump
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
KR101667589B1 (en) * 2014-06-12 2016-10-28 엘지전자 주식회사 Dish Washer and Control Method for the Same
KR101672284B1 (en) * 2014-06-12 2016-11-03 엘지전자 주식회사 Dishwasher and Control Method for the same
CN106367912B (en) * 2015-07-22 2019-04-05 东芝生活电器株式会社 Tumbling-box washing machine
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
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

Citations (1)

* 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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4010049C1 (en) * 1990-03-29 1991-10-10 Grundfos International A/S, Bjerringbro, Dk Pump unit for heating or cooling circuit - uses frequency regulator to reduce rotation of pump motor upon detected overheating
JPH06323295A (en) * 1993-05-17 1994-11-22 Chiyoda Corp Method for cooling down and hotting up pump for low temperature liquid
DE10142525B4 (en) * 2001-08-30 2008-08-21 Miele & Cie. Kg Circulation pump with integrated flushing water heater and a temperature safety switch

Patent Citations (1)

* 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

Also Published As

Publication number Publication date
EP1566477A1 (en) 2005-08-24

Similar Documents

Publication Publication Date Title
US6887318B2 (en) Adaptive fill for dishwashers
JP3571666B2 (en) Automatic dishwasher
RU2367734C2 (en) Method of washing machine control
CA1243718A (en) Electronic pressing iron
US6553594B2 (en) Control system for clothes washing machine incorporating heater
US6949945B2 (en) Method and apparatus for measurement of the winding temperature of a drive motor
EP2323532B1 (en) Water-conducting household appliance, in particular dishwasher or washing machine
RU2303668C2 (en) Washing machine
CA2265348C (en) Turbidity sensor that interrupts drain motor and water valve
US5408716A (en) Fluid-handling machine incorporating a closed loop system for controlling liquid load
KR100758405B1 (en) Inverter of washing machine and inverter of washing machine/dryer
EP0476526B1 (en) Dishwasher with fill water control
KR100457430B1 (en) Dish Washer and Control Method of The Same
US9844801B2 (en) Dishwasher
US7232494B2 (en) Stop start wash cycle for dishwashers
DE102008029910C5 (en) Method for recognizing the load status of a pump
KR101375493B1 (en) Dishwasher
US3378933A (en) Drying system for dishwasher
US4410329A (en) Washing machine with oversuds detection and correction capability
US4481786A (en) Electronic control for a domestic appliance
US8557048B2 (en) Method for controlling a filling process of a water-bearing household appliance
KR100872218B1 (en) Controlling apparatus for dryer
US10351989B2 (en) Appliance for drying laundry with enhanced operation flexibility
DE102010016457A1 (en) Method and apparatus for determining the size of a laundry load
US9204778B2 (en) Dishwasher with a manually adaptable wash program

Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8139 Disposal/non-payment of the annual fee