EP0924331B1 - Sicherung in der Heizschaltung einer Waschmaschine ,einer Geschirrspülmaschine oder eines Trockners - Google Patents

Sicherung in der Heizschaltung einer Waschmaschine ,einer Geschirrspülmaschine oder eines Trockners Download PDF

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Publication number
EP0924331B1
EP0924331B1 EP98122364A EP98122364A EP0924331B1 EP 0924331 B1 EP0924331 B1 EP 0924331B1 EP 98122364 A EP98122364 A EP 98122364A EP 98122364 A EP98122364 A EP 98122364A EP 0924331 B1 EP0924331 B1 EP 0924331B1
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EP
European Patent Office
Prior art keywords
heating
circuit
switch
safety
potentials
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
EP98122364A
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English (en)
French (fr)
Other versions
EP0924331A3 (de
EP0924331A2 (de
Inventor
Jorge c/o Whirlpool Europe s.r.l./Pat. Dep Thumm
Guenther c/o Whirlpool Europe s.r.l./Pat. Leins
Robert c/o Whirlpool Europe s.r.l./Pat. Pöttger
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Whirlpool Corp
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Whirlpool Corp
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Publication date
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Publication of EP0924331A2 publication Critical patent/EP0924331A2/de
Publication of EP0924331A3 publication Critical patent/EP0924331A3/de
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Publication of EP0924331B1 publication Critical patent/EP0924331B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • A47L15/4285Water-heater arrangements
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F34/00Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/08Control circuits or arrangements thereof
    • 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
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00Domestic laundry dryers
    • D06F58/20General details of domestic laundry dryers 
    • D06F58/26Heating arrangements, e.g. gas heating equipment
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/52Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers related to electric heating means, e.g. temperature or voltage
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/28Electric heating

Definitions

  • the invention relates to a safety circuit for a heating circuit of a washing machine, dishwasher or drier, wherein the heating circuit includes a series connection comprising heating switching contact, heating resistor and safety switch, and wherein a monitoring arrangement monitors the heating circuit for faults and, in the event of a fault, causes the heating circuit or the machine to be switched-off.
  • Such safety circuits are in fact very important for washing machines, dishwashers or driers, so that, in the event of faults occurring in the heating circuit, the heating means is prevented from overheating, which would cause component parts to be damaged or destroyed, and fires are prevented from being produced.
  • the latter applies, more especially, when flat-tube heater bodies are used.
  • a safety circuit with two level switches is known.
  • the two level switches monitor a lower level and an upper level for the water line and are used to increase the number of possible water lines and to reduce the consumption of energy required for the washing process.
  • the two level switches do not provide a high degree of safety to prevent the heating means from overheating.
  • the heating circuit is normally actuated via a level switch.
  • a control contact precedes the control motor of the program switch and closes one or two steps in front of the control contact, which actuates the heating circuit.
  • JP09024197 discloses a clothes drying machine having a safety circuit for a heater for chemical supply.
  • a safety circuit which provides a temperature regulator and a temperature limiter.
  • a means for safeguarding the electrical heating resistors from overheating is achieved when at least two contacts, which directly actuate the heating means, of the temperature regulator and of the temperature limiter are connected in series with the heating resistors in such a manner that one contact precedes the heating resistors and one contact follows said resistors.
  • the contact of a level switch is incorporated in the series connection, but the faulty function thereof is not monitored.
  • the reaction time of the temperature limiters or thermostats respectively limits the effectiveness. Serious damage or fires may occur, more especially when plastics materials are used in the vicinity of the heating resistors, before the safety elements respond. Furthermore, the effectiveness cannot be ensured over the entire depth of the appliance by any inclined containers.
  • flat-tube heater bodies may burn out when they become overheated; for example, a partial earth short circuit is formed in the event of overheating or as a result of corrosion. This type of fault is not reliably detected by temperature limiters or thermostats.
  • DE 195 15 902 C1 shows a safety circuit without temperature limiters and thermostats. Provision is made therein for two level switches to monitor the normal water position and to control a switching element in series connection; for the switching element to trigger the control motor; and for the control motor to connect the heating resistor in parallel with the switching element via control contacts after a prescribed time has passed in the stimulating and washing phase following the water supply phase.
  • the actuation of the heating means is prepared only when both level switches indicate and connect the normal level of the water line, and the heating means is actuated via control contacts of the control motor after a time prescribed by the control.
  • this known safety circuit still requires considerable outlay and does not detect any faults in the heating circuit, such as a short circuit or a disconnection of component parts.
  • the potential conditions occurring in the heating circuit can be detected without considerable outlay and evaluated, via the logic circuit, as to whether there is a correct or faulty switching state of the heating circuit.
  • the logic circuit can immediately induce the switching-off of the heating circuit or the machine.
  • the safety circuit can be extended in such a manner that a level switch is incorporated in the heating circuit between the heating resistor and the safety switch, and an additional potential is supplied to the logic circuit at the junction between the level switch and the safety switch. Provision is therefore made for the heating switching contact and the level switch to be configured as working contacts, and for the level switch to be closed if the water line in the machine is adequate.
  • the safety switch e.g. relay
  • the safety switch e.g. relay
  • the junction between heating switching contact and heating resistor to be connected to the inoperative contact of the safety switch via a measuring resistor
  • a specific potential condition at the control inputs of the logic circuit can be achieved if there is no actuation of the safety switch by the logic circuit, even in the initial state when all of the switches are to be open.
  • the embodiment is also such that a voltage divider, formed from resistors, is connected to at least one junction of the heating circuit, and the potentials at the pick-up points of the voltage dividers are supplied to the control inputs of the logic circuit as control potentials.
  • the heating circuit can then be checked for the presence of the correct initial state before and possibly after the heating process.
  • the heating switching contact, and possibly the level switch and the safety switch must be open or respectively be in their initial switching position. In consequence, a blocked air trap/kinked hose and therefore closed level switch contacts can also be detected.
  • the logic circuit preferably includes a microprocessor, which detects the potentials present at its control inputs; it logically links such potentials and compares them with prescribed desired value combinations, which correspond to correct switching states of the heating circuit.
  • the heating circuit comprises a series connection of heating switching contact HSK, heating resistor HW, switch NV and safety switch SiS, which is connectable to a supply voltage.
  • the connection may be effected in known manner via a program switch, which determines the actuation of the heating means during the course of the washing or rinsing process.
  • the supply voltage may be derived from the mains voltage.
  • a measuring resistor Rm branches-off at the junction a between the heating switching contact HSK and the heating resistor HW, said measuring resistor being connected to the inoperative side of the safety switch SiS, which is configured as a switchover contact, and, in consequence, has a specific potential of the supply voltage at the junction a in the initial state (HSK open, SiS in its initial position) of the heating circuit.
  • At least one voltage divider SP2 which is formed from resistors (e.g. R3 and R4), is connected at the junctions a , b and c between the heating switching contact HSK and the safety switch SiS.
  • the control voltage ub for the control input B of a logic circuit LS which occurs in view of the potential u2, is picked-up at the pick-up point e of the voltage divider SP2 and is compared with prescribed potential conditions.
  • These prescribed potential conditions are stored in the logic circuit LS, which is possibly provided with a microprocessor, and they correspond to potential conditions which correspond to the correct switching states of the heating circuit (e.g. initial position and operative state). If a fault occurs in the heating circuit, e.g.
  • the logic circuit LS detects a deviation from the permissible potential conditions and issues a switch-off signal AS, which may be used to switch-off the heating circuit or the machine.
  • a switch-off signal AS which may be used to switch-off the heating circuit or the machine.
  • the safety circuit together with the monitoring of the potential conditions at various locations of the heating circuit and with the control of permissible potential combinations in the logic circuit LS, can also be achieved with the reverse connection of the heating circuit to the supply voltage and any desirable supply voltages for the voltage divider SP2.
  • Fig. 1 illustrates, the voltage u2 at the junction b changes in the heating circuit depending on the switching state and faults in the heating circuit with its component parts, as does the control voltage ub for the logic circuit LS.
  • the control voltage ub is then decisive for the state of the heating circuit and forms the basis for the comparison with the permissible potential combinations, stored in the logic circuit LS.
  • the monitoring of the heating circuit can be effected at two/three locations, whereby the voltages u1, u2 and u3 determine the control voltages ua, ub and uc, which are compared with prescribed, permissible two/three potential combinations.
  • all of the component parts of the heating circuit, incl. level switch, pump, air trap are again monitored jointly, and an improved operational reliability is achieved in the heating circuit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Control Of Resistance Heating (AREA)

Claims (7)

  1. Sicherungsstromkreis für einen Heizschaltkreis einer Waschmaschine, einer Geschirrspülmaschine oder eines Trockners, wobei der Heizschaltkreis eine Reihenschaltung beinhaltet, die einen Heiz-Schaltkontakt, einen Heiz-Resistor sowie einen Sicherungsschalter umfasst, und wobei eine Überwachungsanordnung den Heizschaltkreis auf Fehler überwacht und im Fall eines Fehlers bewirkt, dass der Heizschaltkreis oder die Maschine abgeschaltet wird, dadurch gekennzeichnet, dass der Sicherungsstromkreis Mittel zum Zuführen von Potentialen (u2 und u1 und/oder u3) an den Anschlüssen (b und a und/oder c) zwischen dem Heiz-Resistor (HW) und dem Sicherungsschalter (SiS) und/oder zwischen dem Heizschaltkontakt (HSK) und dem Heiz-Resistor (HW) an einem Logikschaltkreis (LS) umfasst, wobei dieser Logikschaltkreis in der Lage ist, derartige Potentiale mit vorgeschriebenen Potentialbedingungen zu vergleichen, die in dem Logikschaltkreis gespeichert sind, und nur dann kein Fehlersignal zum Ausschalter (AS) des Heizschaltkreis oder der Maschine auszugeben, wenn die Potentialbedingungen in dem Heizschaltkreis korrekt sind.
  2. Sicherungsstromkreis gemäß Anspruch 1, dadurch gekennzeichnet, dass ein Schalter (NV), der ebenso ein Niveau-Schalter sein kann, in dem Heizschaltkreis zwischen dem Heiz-Resistor (HW) und dem Sicherungsschalter (SiS) eingebaut ist, und dass ein drittes Potential (u3) zum Logikschaltkreis (LS) an dem Anschluss (c) zwischen dem Schalter (NV), der ebenso ein Niveau-Schalter sein kann, und dem Sicherungsschalter (SiS) zugeführt wird.
  3. Sicherungsstromkreis gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Heiz-Schaltkontakt (HSK) und der Schalter (NV), der ebenso ein Niveau-Schalter sein kann, als Arbeitskontakte ausgebildet sind und dass der Schalter (NV) im Normalfall in der Maschine geschlossen ist.
  4. Sicherungsstromkreis gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Sicherungsschalter (SiS) als Umschaltkontakt ausgebildet ist, der dann wenn keine Betätigung durch den Logikschaltkreis (LS) im Ursprungszustand vorliegt, einen Mess-Resistor (Rm) mit dem Anschluss (a) zwischen dem Heiz-Schaltkontakt (HSK) und dem Heiz-Resistor (HW) im Falle eines unterbrochenen Heizschaltkreises verbindet.
  5. Sicherungsstromkreis gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass aus Resistoren (beispielsweise R1 und R2, R3 und R4, R5 und R6) ausgebildete Spannungsteiler (SP1, SP2, SP3) mit jedem der Anschlüsse (a, b, c) des Heizschaltkreises verbunden sind und dass die Potentiale (ua, ub, uc) an den Aufnehmerpunkten (d, e, f) der Spannungsteiler (SP1, SP2, SP3) zu den Steuerungs-Eingaben (A, B, C) des Logikschaltkreises (LS) als Steuerungspotentiale zugeführt werden.
  6. Sicherungsstromkreis gemäß einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass vor und nach dem Verschließen des Heiz-Schaltkontakts (HSK) und/oder nach dem Aufheiz-Prozess, wenn das Wasser abgepumpt wird, der Heizschaltkreis das Vorliegen von Potential-Bedingungen (ua, ub, uc), die durch die Spannungsteiler (SP1, SP2, SP3) vorgeschrieben sind und vorherrschen, wenn der Heiz-Schaltkontakt (HSK) offen und verschlossen ist, überprüft, wann der Schalter (NV), der ebenso ein Niveau-Schalter sein kann, offen und möglicherweise verschlossen ist, und wann der Sicherungsschalter (SiS) offen und verschlossen ist.
  7. Sicherungsstromkreis gemäß einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Logikschaltkreis (LS) einen Mikroprozessor beinhaltet, der die existierenden Potentiale (ua, ub, uc) detektiert und diese Potentiale logisch miteinander verknüpft und diese mit vorgeschriebenen gewünschten Werte-Kombinationen, die mit den korrekten Schalt-Zuständen des Heizschaltkreises korrespondieren, vergleicht.
EP98122364A 1997-12-11 1998-11-25 Sicherung in der Heizschaltung einer Waschmaschine ,einer Geschirrspülmaschine oder eines Trockners Expired - Lifetime EP0924331B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19755089 1997-12-11
DE19755089A DE19755089C2 (de) 1997-12-11 1997-12-11 Sicherheitsschaltung für einen Heizkreis einer Wasch-, Geschirrspülmaschine oder eines Trockners

Publications (3)

Publication Number Publication Date
EP0924331A2 EP0924331A2 (de) 1999-06-23
EP0924331A3 EP0924331A3 (de) 2000-01-19
EP0924331B1 true EP0924331B1 (de) 2006-07-12

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EP98122364A Expired - Lifetime EP0924331B1 (de) 1997-12-11 1998-11-25 Sicherung in der Heizschaltung einer Waschmaschine ,einer Geschirrspülmaschine oder eines Trockners

Country Status (2)

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EP (1) EP0924331B1 (de)
DE (2) DE19755089C2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008016629A1 (de) * 2008-04-01 2009-10-08 BSH Bosch und Siemens Hausgeräte GmbH Schaltungsanordnung zum Betreiben eines Hausgeräts und entsprechendes Verfahren
EP2569476B1 (de) 2010-05-14 2015-06-03 Electrolux Home Products Corporation N.V. Heizschaltung mit überwachungsanordnung für ein haushaltsgerät
EP2887764A2 (de) 2013-12-20 2015-06-24 BSH Hausgeräte GmbH Haushaltsgerät und Überwachungsverfahren für ein Haushaltsgerät

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005020095A1 (de) 2005-04-29 2006-11-02 BSH Bosch und Siemens Hausgeräte GmbH Elektrischer Schaltkreis
DE102008006512A1 (de) 2008-01-29 2009-07-30 BSH Bosch und Siemens Hausgeräte GmbH Schaltungsanordnung zum Betreiben eines Hausgeräts und entsprechendes Verfahren
DE102008011495B4 (de) * 2008-02-19 2011-09-22 E.G.O. Control Systems Gmbh Steuergerät für ein Haushaltsgerät, Haushaltsgerät und zugehöriges Verfahren
DE102008056412A1 (de) * 2008-11-07 2010-05-12 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät mit einer Luft-Trocknungsvorrichtung und/oder Flüssigkeits-Heizungseinrichtung sowie zugehöriges Verfahren
DE102009046083A1 (de) 2009-10-28 2011-05-12 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät, insbesondere Geschirrspülmaschine
DE102010028533A1 (de) * 2010-05-04 2011-11-10 BSH Bosch und Siemens Hausgeräte GmbH Haushaltsgerät und Verfahren zum Überprüfen eines elektrischen Verbrauchers eines Haushaltsgerätes
EP2386680B1 (de) 2010-05-14 2014-06-04 Electrolux Home Products Corporation N.V. Heizschaltung mit Überwachungsanordnung für ein Haushaltsgerät
ITMI20100862A1 (it) * 2010-05-14 2011-11-15 Electrolux Home Products Corporatio N N V Monitoraggio di guasti del circuito di riscaldamento di un elettrodomestico
TR201104260A2 (tr) * 2011-05-02 2011-07-21 Vestel Beyaz E�Ya Sanay� Ve T�Caret Anon�M ��Rket� Yıkama makinesi test yöntemi.
CN106149284B (zh) * 2015-04-28 2019-04-26 青岛海尔洗衣机有限公司 一种洗衣机故障检测处理方法
EP3177104B1 (de) 2015-12-02 2018-09-19 Whirlpool Corporation Diagnoseverfahren für einen elektrischen heizer
EP3175761B1 (de) * 2015-12-02 2018-08-29 Whirlpool Corporation Verfahren zur detektion eines fehlers in einem installierten gerät
EP3176306A1 (de) 2015-12-02 2017-06-07 Whirlpool Corporation Verfahren zur detektion eines fehlers in einer wasserbetriebenen vorrichtung

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
DE1908464C3 (de) * 1969-02-20 1975-09-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Sicherungseinrichtung für die elektrische Heizeinrichtung bei Wasch- und Geschirrspülmaschinen
DE2647616B2 (de) * 1976-10-21 1979-07-12 Buderus Ag, 6300 Lahn-Wetzlar Trommelwaschmaschine mit einem Programmschalter
DE4103373C2 (de) * 1991-02-05 1994-06-16 Stiebel Eltron Gmbh & Co Kg Durchlauferhitzer
DE19515902C1 (de) * 1995-03-31 1996-07-11 Bauknecht Hausgeraete Sicherheitsschalteinrichtung gegen das Trockengehen elektrischer Heizwiderstände für Wasch- und Geschirrspülmaschinen
JPH0924197A (ja) * 1995-07-10 1997-01-28 Matsushita Electric Ind Co Ltd 衣類乾燥機

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008016629A1 (de) * 2008-04-01 2009-10-08 BSH Bosch und Siemens Hausgeräte GmbH Schaltungsanordnung zum Betreiben eines Hausgeräts und entsprechendes Verfahren
EP2569476B1 (de) 2010-05-14 2015-06-03 Electrolux Home Products Corporation N.V. Heizschaltung mit überwachungsanordnung für ein haushaltsgerät
EP2887764A2 (de) 2013-12-20 2015-06-24 BSH Hausgeräte GmbH Haushaltsgerät und Überwachungsverfahren für ein Haushaltsgerät
DE102013226833A1 (de) 2013-12-20 2015-06-25 BSH Hausgeräte GmbH Haushaltsgerät und Überwachungsverfahren für ein Haushaltsgerät

Also Published As

Publication number Publication date
EP0924331A3 (de) 2000-01-19
DE69835195T2 (de) 2007-07-05
EP0924331A2 (de) 1999-06-23
DE19755089A1 (de) 1999-06-24
DE69835195D1 (de) 2006-08-24
DE19755089C2 (de) 2003-07-03

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