EP0924331B1 - Sécurité sur le circuit de chauffage d'une machine à laver le linge ou la vaisselle ou d'un sèche-linge - Google Patents

Sécurité sur le circuit de chauffage d'une machine à laver le linge ou la vaisselle ou d'un sèche-linge 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
Authority
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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German (de)
English (en)
Other versions
EP0924331A2 (fr
EP0924331A3 (fr
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
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.)
Whirlpool Corp
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Whirlpool Corp
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Publication date
Application filed by Whirlpool Corp filed Critical Whirlpool Corp
Publication of EP0924331A2 publication Critical patent/EP0924331A2/fr
Publication of EP0924331A3 publication Critical patent/EP0924331A3/fr
Application granted granted Critical
Publication of EP0924331B1 publication Critical patent/EP0924331B1/fr
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 Resistance Heating (AREA)
  • Control Of Washing Machine And Dryer (AREA)

Claims (7)

  1. Circuit de sécurité pour un circuit de chauffage d'une machine à laver le linge, d'un lave-vaisselle ou d'un sèche-linge, dans lequel le circuit de chauffage comprend une connexion en série comprenant un contact de commutation de chauffage, une résistance de chauffage et un interrupteur de sécurité, et dans lequel un dispositif de surveillance surveille le circuit de chauffage à la recherche de défaillances et, en cas de défaillance, provoque la coupure du circuit de chauffage ou de la machine, caractérisé en ce que le circuit de sécurité comprend des moyens pour fournir des potentiels (u2 et u1 et/ou u3) aux jonctions (b et a et/ou c) entre une résistance de chauffage (HW) et un interrupteur de sécurité (SiS) et/ou entre un contact de commutation de chauffage (HSK) et une résistance de chauffage (HW) à un circuit logique (LS), ledit circuit logique étant approprié pour comparer lesdits potentiels avec des conditions de potentiel prescrites stockées dans le circuit logique et pour ne délivrer aucun signal de défaillance pour couper (AS) le circuit de chauffage ou la machine uniquement lorsque les conditions de potentiel dans le circuit de chauffage sont correctes.
  2. Circuit de sécurité selon la revendication 1, caractérisé en ce qu'un commutateur (NV), qui peut également être un commutateur de niveau, est incorporé dans le circuit de chauffage entre la résistance de chauffage (HW) et l'interrupteur de sécurité (SiS), et en ce qu'un troisième potentiel (u3) est fourni au circuit logique (LS) à la jonction (c) entre le commutateur (NV), qui peut également être un commutateur de niveau, et l'interrupteur de sécurité (SiS).
  3. Circuit de sécurité selon la revendication 1 ou 2, caractérisé en ce que le contact de commutation de chauffage (HSK) et le commutateur (NV), qui peut également être un commutateur de niveau, sont configurés sous la forme de contacts de travail, et en ce que le commutateur (NV) est fermé dans la condition normale de la machine.
  4. Circuit de sécurité selon l'une quelconque des revendications 1 à 3, caractérisé en ce que l'interrupteur de sécurité (SiS) est configuré sous la forme d'un contact à permutation qui, s'il n'y a pas d'actionnement par le circuit logique (LS) à l'état initial, connecte une résistance de mesure (Rm) à la jonction (a) entre le contact de commutation de chauffage (HSK) et la résistance de chauffage (HW) dans le cas d'un circuit de chauffage interrompu.
  5. Circuit de sécurité selon l'une quelconque des revendications 1 à 4, caractérisé en ce que des diviseurs de tension (SP1, SP2, SP3) constitués de résistances (par exemple, R1 et R2, R3 et R4, R5 et R6) sont connectés à chacune des jonctions (a, b, c) du circuit de chauffage, et les potentiels (ua, ub, uc) aux points de prélèvement (d, e, f) des diviseurs de tension (SP1, SP2, SP3) sont fournis aux entrées de commande (A, B, C) du circuit logique (LS) comme potentiels de commande.
  6. Circuit de sécurité selon l'une quelconque des revendications 1 à 5, caractérisé en ce que, avant et après la fermeture du contact de commutation de chauffage (HSK) et/ou après le processus de chauffage lorsque l'eau est évacuée, le circuit de chauffage est vérifié à la recherche de la présence des conditions de potentiel (ua, ub, uc) qui sont prescrites par les diviseurs de tension (SP1, SP2, SP3) et qui prédominent lorsque le contact de commutation de chauffage (HSK) est ouvert et fermé, lorsque le commutateur (NV), qui peut également être un commutateur de niveau, est ouvert et éventuellement fermé, et lorsque l'interrupteur de sécurité (SiS) est ouvert et fermé.
  7. Circuit de sécurité selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le circuit logique (LS) comprend un microprocesseur qui détecte les potentiels existants (ua, ub, uc), qui lie de façon logique lesdits potentiels et qui les compare avec des combinaisons de valeurs souhaitées prescrites qui correspondent aux états de commutation corrects du circuit de chauffage.
EP98122364A 1997-12-11 1998-11-25 Sécurité sur le circuit de chauffage d'une machine à laver le linge ou la vaisselle ou d'un sèche-linge Expired - Lifetime EP0924331B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

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Application Number Title Priority Date Filing Date
EP98122364A Expired - Lifetime EP0924331B1 (fr) 1997-12-11 1998-11-25 Sécurité sur le circuit de chauffage d'une machine à laver le linge ou la vaisselle ou d'un sèche-linge

Country Status (2)

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

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 (fr) 2010-05-14 2015-06-03 Electrolux Home Products Corporation N.V. Circuit de chauffage dote d'un agencement de surveillance destine a un appareil electromenager
EP2887764A2 (fr) 2013-12-20 2015-06-24 BSH Hausgeräte GmbH Appareil ménager et procédé de surveillance pour un appareil ménager

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
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
EP2386680B1 (fr) 2010-05-14 2014-06-04 Electrolux Home Products Corporation N.V. Circuit de chauffage avec surveillance de l'agencement pour appareil domestique
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
EP3176306A1 (fr) 2015-12-02 2017-06-07 Whirlpool Corporation Procédé pour détecter un défaut dans un appareil fonctionnant à l'eau
EP3175761B1 (fr) * 2015-12-02 2018-08-29 Whirlpool Corporation Procédé pour détecter un défaut dans un appareil installé
EP3177104B1 (fr) 2015-12-02 2018-09-19 Whirlpool Corporation Procédé de diagnostic pour un chauffage électrique

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 (fr) 2010-05-14 2015-06-03 Electrolux Home Products Corporation N.V. Circuit de chauffage dote d'un agencement de surveillance destine a un appareil electromenager
EP2887764A2 (fr) 2013-12-20 2015-06-24 BSH Hausgeräte GmbH Appareil ménager et procédé de surveillance pour un appareil ménager
DE102013226833A1 (de) 2013-12-20 2015-06-25 BSH Hausgeräte GmbH Haushaltsgerät und Überwachungsverfahren für ein Haushaltsgerät

Also Published As

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

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