EP0940113B1 - Safety circuit for domestic appliances using water - Google Patents

Safety circuit for domestic appliances using water Download PDF

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Publication number
EP0940113B1
EP0940113B1 EP99103642A EP99103642A EP0940113B1 EP 0940113 B1 EP0940113 B1 EP 0940113B1 EP 99103642 A EP99103642 A EP 99103642A EP 99103642 A EP99103642 A EP 99103642A EP 0940113 B1 EP0940113 B1 EP 0940113B1
Authority
EP
European Patent Office
Prior art keywords
circuit
accordance
safety circuit
logic circuit
water
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
EP99103642A
Other languages
German (de)
French (fr)
Other versions
EP0940113A1 (en
Inventor
Manfred Whirlpool Europe s.r.l. Mayr-Willius
Nikolaus Whirlpool Europe s.r.l. Wingert
Roland Whirlpool Europe s.r.l. Anderer
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
Original Assignee
Whirlpool Corp
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 Whirlpool Corp filed Critical Whirlpool Corp
Publication of EP0940113A1 publication Critical patent/EP0940113A1/en
Application granted granted Critical
Publication of EP0940113B1 publication Critical patent/EP0940113B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • A47L15/421—Safety arrangements for preventing water damage
    • 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
    • D06F2105/58—Indications or alarms to the control system or to the user
    • D06F2105/60—Audible signals
    • 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
    • D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
    • D06F34/10—Power supply arrangements, e.g. stand-by circuits

Definitions

  • the invention relates to a safety circuit for domestic appliances using water, in particular washing machines and dishwashers, with a program selector, a level switch connected with washing or rinsing containers and a leak detecting device in a water collecting trough.
  • Safety circuits for domestic appliances using water are known by which controllable valves are inserted in the water supply, which are controllable by the leak-detecting device, as shown in DE 34 25 588 C2 and DE 34 40 695 A1. With these safety circuits the only assurance is that when a leak occurs the water supply to the domestic appliance is cut off.
  • this object is achieved by the provision of an additional logic circuit continuously fed by the mains alternating voltage which can be triggered by the program selector, the level switch and the leak detection device, by the logic circuit under the predetermined trigger conditions switching on the process control to the power supply and by the process control, as a function of the existing control conditions, effecting predetermined switching processes through components (e.g. pump) of the domestic appliance.
  • the logic circuit is designed as an OR circuit, that associated control signals to the control input of the OR circuit are sent by the program selector with any selected program, the level switch on exceeding a predetermined fill level in the washing or rinsing container and the leak detection device on the appearance of water from a leak in the water-collecting trough and the OR circuit when triggered switches on the power supply to the process control through at least one control input through an electronically triggerable switching device.
  • the triggering conditions for the logic circuit can be derived by designing the program selector as a rotary switch with a number of switch positions corresponding with the programs each of which is associated with a control input of the logic circuit or by forming the program selector with a number of on/off switches corresponding to the number of programs each of which is associated with a control input of the logic circuit.
  • the monitoring of the fill level in the washing or rinsing container by means of the level switch is designed in such a way that the switching level in respect of washing or rinsing container is lower than the lower edge of the door opening of the domestic appliance.
  • an acoustic and optical alarm is given when the appliance is switched off and the logic circuit is actuated.
  • the switching processes are effected, preferably after a delay, through the process control.
  • the coordination switching processes for the remedial action to be taken is provided by the triggering conditions for the logic circuit and the process control.
  • the invention will be more particularly defined by means of an exemplary embodiment shown as an block circuit diagram in the drawing.
  • an additional logic circuit LS is permanently connected to a power supply, i.e. it can be operated even when the domestic appliance is switched off.
  • the program selector PW of the domestic appliance controls the process control PS of the domestic appliance not only when it is running but also the logic circuit LS with the program leads P1 to Pn.
  • a separate control lead sn+1 for the logic circuit LS is provided for the leak detector device LA in the water-collecting trough underneath the domestic appliance.
  • the leak detecting device LA puts a control signal to the logic circuit LS on this control lead sn+1 if it detects water from a leakage in the water-collecting trough.
  • a level switch WÜS the switching level of which is below the door opening is connected with the washing or rinsing container of the domestic appliance. In this way, if the domestic appliance is switched off and the door is open, escape of water from the appliance is prevented if the supply valve is jammed and water enters the washing or rinsing container even when the appliance is not operating.
  • this level switch WÜS gives a control signal to the control input on the logic circuit LS and the control input wüs of the process control PS.
  • the logic circuit LS If the logic circuit LS is designed as an OR circuit, then it responds to any desired trigger on the control inputs s1 to sm and switches on the electronic switching circuit ES. For this, the process control PS is switched on to the power supply SPV, regardless of the operating circuits (not shown) and can actuate other switching processes, associated with the various triggering conditions, because of the existing switching conditions. Thus, these switching processes include an acoustic and optical alarm.
  • the components GA of the domestic appliance for example, the discharge pump, can advantageously be set in motion after a certain delay as remedial measures on the occurrence of a certain trigger for pumping out water.
  • the remedial measure to be effected can be selected as a function of the operating conditions on the control units s1 to sm of the logic circuit LS and the control inputs p1 to pn as well as 1a and wüs of the process control PS, as a result of which the components GA of the domestic appliance to be activated are switched on and off through the power control NST.
  • the choice of the remedial measures to be taken in this case will also depend on the nature of the domestic appliance.
  • the leak detecting device LA may advantageously be formed as a conductivity sensor.
  • two metal plates may form the conductivity sensor which is introduced into the water collecting trough.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Washing And Drying Of Tableware (AREA)
  • Examining Or Testing Airtightness (AREA)

Description

  • The invention relates to a safety circuit for domestic appliances using water, in particular washing machines and dishwashers, with a program selector, a level switch connected with washing or rinsing containers and a leak detecting device in a water collecting trough.
  • Safety circuits for domestic appliances using water, of this type, are known by which controllable valves are inserted in the water supply, which are controllable by the leak-detecting device, as shown in DE 34 25 588 C2 and DE 34 40 695 A1. With these safety circuits the only assurance is that when a leak occurs the water supply to the domestic appliance is cut off.
  • It is the object of the invention to improve a safety circuit of the type mentioned in the preamble so that fault conditions leading to damage are recognised both when the domestic appliance is switched off as well as when it is switched on and corrective measures can be introduced.
  • In accordance with the invention, this object is achieved by the provision of an additional logic circuit continuously fed by the mains alternating voltage which can be triggered by the program selector, the level switch and the leak detection device, by the logic circuit under the predetermined trigger conditions switching on the process control to the power supply and by the process control, as a function of the existing control conditions, effecting predetermined switching processes through components (e.g. pump) of the domestic appliance.
  • With this additional logic circuit, switching processes can be effected through the process control even when the domestic appliance is switched off, which leads not only to an indication of the fault but can also be adapted to remove the undesired effects of the fault. Thus, even with domestic appliances which are switched off, an alarm signal can be given if water from a leak appears in the water collecting trough or inside the appliance.
  • According to one simple embodiment it is intended that the logic circuit is designed as an OR circuit, that associated control signals to the control input of the OR circuit are sent by the program selector with any selected program, the level switch on exceeding a predetermined fill level in the washing or rinsing container and the leak detection device on the appearance of water from a leak in the water-collecting trough and the OR circuit when triggered switches on the power supply to the process control through at least one control input through an electronically triggerable switching device.
  • The triggering conditions for the logic circuit can be derived by designing the program selector as a rotary switch with a number of switch positions corresponding with the programs each of which is associated with a control input of the logic circuit or by forming the program selector with a number of on/off switches corresponding to the number of programs each of which is associated with a control input of the logic circuit.
  • The monitoring of the fill level in the washing or rinsing container by means of the level switch is designed in such a way that the switching level in respect of washing or rinsing container is lower than the lower edge of the door opening of the domestic appliance.
  • In one embodiment, an acoustic and optical alarm is given when the appliance is switched off and the logic circuit is actuated. To remove faults the switching processes are effected, preferably after a delay, through the process control. The coordination switching processes for the remedial action to be taken is provided by the triggering conditions for the logic circuit and the process control.
  • The invention will be more particularly defined by means of an exemplary embodiment shown as an block circuit diagram in the drawing.
  • In the block circuit diagram the operating circuit of the intended programs of the domestic appliance will not be considered in more detail. These circuits are formed in known ways and are operated in accordance with the predetermined program.
  • In order to carry out remedial action in the event of a fault a so-called stand-by operation comes into play. For this, an additional logic circuit LS is permanently connected to a power supply, i.e. it can be operated even when the domestic appliance is switched off.
  • The program selector PW of the domestic appliance controls the process control PS of the domestic appliance not only when it is running but also the logic circuit LS with the program leads P1 to Pn. A separate control lead sn+1 for the logic circuit LS is provided for the leak detector device LA in the water-collecting trough underneath the domestic appliance. The leak detecting device LA puts a control signal to the logic circuit LS on this control lead sn+1 if it detects water from a leakage in the water-collecting trough.
  • A level switch WÜS, the switching level of which is below the door opening is connected with the washing or rinsing container of the domestic appliance. In this way, if the domestic appliance is switched off and the door is open, escape of water from the appliance is prevented if the supply valve is jammed and water enters the washing or rinsing container even when the appliance is not operating. When actuated, this level switch WÜS gives a control signal to the control input on the logic circuit LS and the control input wüs of the process control PS.
  • If the logic circuit LS is designed as an OR circuit, then it responds to any desired trigger on the control inputs s1 to sm and switches on the electronic switching circuit ES. For this, the process control PS is switched on to the power supply SPV, regardless of the operating circuits (not shown) and can actuate other switching processes, associated with the various triggering conditions, because of the existing switching conditions. Thus, these switching processes include an acoustic and optical alarm. The components GA of the domestic appliance, for example, the discharge pump, can advantageously be set in motion after a certain delay as remedial measures on the occurrence of a certain trigger for pumping out water. The remedial measure to be effected can be selected as a function of the operating conditions on the control units s1 to sm of the logic circuit LS and the control inputs p1 to pn as well as 1a and wüs of the process control PS, as a result of which the components GA of the domestic appliance to be activated are switched on and off through the power control NST. The choice of the remedial measures to be taken in this case will also depend on the nature of the domestic appliance.
  • The leak detecting device LA may advantageously be formed as a conductivity sensor. For this, two metal plates may form the conductivity sensor which is introduced into the water collecting trough.

Claims (9)

  1. Safety circuit for domestic appliances using water, particularly washing machines and dishwashers, with a program selector, a level switch in the washing or rinsing container and a leak detector in a water collecting trough,
    characterised in that
    an additional logic circuit (LS) continuously fed by mains alternating current is provided which is controllable by the program selector (PW), the level switch (WÜS) and the leak detector device (LA),
    the logic circuit (LS) switches on the process control (PS) to the power supply (SPV) and that the process control (PS) effects predetermined switching processes, as a function of the prevailing trigger conditions, through components (GA) like a pump of the domestic appliance.
  2. Safety circuit in accordance with Claim 1,
    characterised in that
    the logic circuit (LS) is designed as an OR circuit,
    the appropriate trigger signals are supplied to the control inputs (s1...sm) of the OR circuit by the program selector (PW) on any selected program (P1 ... Pk), by the level switch (WÜS) on exceeding a predetermined fill in the washing or rinsing container and by the leak detector (LA) on the appearance of leaked water in the water collecting trough and
    the OR circuit switches on the power supply (SPV) to the process control (PS) by way of an electronically triggerable switching device when triggered by at least one control input (s1...sm).
  3. Safety circuit in accordance with Claim 1 or 2,
    characterised in that
    the program selector (PW) is designed as a rotary switch with a number (k) of switching positions corresponding to the programmes (P1...Pk), to which the control inputs (s1...sn) of the logic circuit (LS) are assigned by way of coding n.
  4. Safety circuit in accordance with Claim 1 or 2,
    characterised in that
    the program selector (PW) is formed with a number (k) of on/off switches corresponding to the programs (P1...Pk), as a rotary switch with a number (k) of switching positions corresponding to the programmes (P1...Pk), to which the control inputs (s1...sn) of the logic circuit (LS) are assigned by way of coding n.
  5. Safety circuit in accordance with one of the claims 1 to 4,
    characterised in that
    the level switch (WÜS) is connected with washing or rinsing containers in such a way that its switching level is below the lower edge of the door opening of the domestic appliance.
  6. Safety circuit in accordance with one of the claims 1 to 5,
    characterised in that
    with a response from the logic circuit) (LS) an acoustic and optical alarm can be given when the process control (PS) is switched off.
  7. Safety circuit in accordance with one of the claims 1 to 6,
    characterised in that
    the switching processes through components (GA) of the domestic appliance can be delayed with respect to the provision of the alarm.
  8. Safety circuit in accordance with one of the claims 1 to 7,
    characterised in that
    the leak detector device (LA) takes the form of a conductivity sensor.
  9. Safety circuit in accordance with Claim 8,
    characterised in that
    the conductivity sensor consists of two metal plates introduced into the water collecting trough.
EP99103642A 1998-03-04 1999-02-25 Safety circuit for domestic appliances using water Expired - Lifetime EP0940113B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19809114A DE19809114C1 (en) 1998-03-04 1998-03-04 Safety circuit for washing machines and dishwashers
DE19809114 1998-03-04

Publications (2)

Publication Number Publication Date
EP0940113A1 EP0940113A1 (en) 1999-09-08
EP0940113B1 true EP0940113B1 (en) 2003-05-07

Family

ID=7859604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99103642A Expired - Lifetime EP0940113B1 (en) 1998-03-04 1999-02-25 Safety circuit for domestic appliances using water

Country Status (3)

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EP (1) EP0940113B1 (en)
DE (2) DE19809114C1 (en)
ES (1) ES2197535T3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007041310B4 (en) 2007-08-31 2016-07-21 BSH Hausgeräte GmbH Water-conducting household appliance
ITTO20100254A1 (en) * 2010-03-30 2011-10-01 Indesit Co Spa APPLIANCES WITH AWAKENING SYSTEM FROM THE STAND-BY
ITTO20110511A1 (en) * 2011-06-09 2012-12-10 Indesit Co Spa APPLIANCES WITH AWAKENING SYSTEM FROM THE STAND-BY
EP2886702B1 (en) * 2013-12-19 2017-02-22 Electrolux Appliances Aktiebolag Overflow control system
DE102017210361A1 (en) 2017-06-21 2018-12-27 BSH Hausgeräte GmbH Water-conducting household appliance

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2602118A1 (en) * 1976-01-21 1977-07-28 Heliowatt Werke Liq. level control device for pipe systems - generates signal to shut corresponding valves or pumps in case of leakage
DE2614053A1 (en) * 1976-04-01 1977-10-06 Licentia Gmbh MONITORING DEVICE FOR THE FLUID INLET OF WASHING AND DISHWASHING MACHINES
DE2918603A1 (en) * 1979-05-09 1980-11-20 Buderus Ag OVERFLOW SECURING DEVICE FOR A WASHING OR DISHWASHER
DE3425588A1 (en) * 1984-07-11 1986-01-23 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Level-control and safety device for water-conducting domestic appliances
DE3440695A1 (en) * 1984-11-07 1986-05-22 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart SAFETY DEVICE FOR WATER-CONTAINING HOUSEHOLD APPLIANCES
DE3717646A1 (en) * 1987-05-26 1988-12-15 Bauknecht Hausgeraete DEVICE FOR PROTECTION AGAINST WATER DAMAGE IN DISHWASHER
GB2235801A (en) * 1989-09-07 1991-03-13 David Stanley Bottomley Leak detection and warning system
DE19548514A1 (en) * 1995-12-22 1997-06-26 Bosch Siemens Hausgeraete Domestic washing machine
DE19548513A1 (en) * 1995-12-22 1997-06-26 Bosch Siemens Hausgeraete Domestic washing machine

Also Published As

Publication number Publication date
DE19809114C1 (en) 1999-06-17
DE69907542D1 (en) 2003-06-12
ES2197535T3 (en) 2004-01-01
DE69907542T2 (en) 2004-03-18
EP0940113A1 (en) 1999-09-08

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