EP0245870B1 - Dispositif de contrôle de filtre pour un appareil électroménager - Google Patents

Dispositif de contrôle de filtre pour un appareil électroménager Download PDF

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Publication number
EP0245870B1
EP0245870B1 EP87107068A EP87107068A EP0245870B1 EP 0245870 B1 EP0245870 B1 EP 0245870B1 EP 87107068 A EP87107068 A EP 87107068A EP 87107068 A EP87107068 A EP 87107068A EP 0245870 B1 EP0245870 B1 EP 0245870B1
Authority
EP
European Patent Office
Prior art keywords
filter
switch
resistor
obstructed
series
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
EP87107068A
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German (de)
English (en)
Other versions
EP0245870A1 (fr
Inventor
Graziello Grandin
Maurizio Mori
Giuseppe Frucco
Piero Babuin
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.)
Industrie Zanussi SpA
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Industrie Zanussi SpA
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Publication date
Application filed by Industrie Zanussi SpA filed Critical Industrie Zanussi SpA
Publication of EP0245870A1 publication Critical patent/EP0245870A1/fr
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Publication of EP0245870B1 publication Critical patent/EP0245870B1/fr
Anticipated expiration legal-status Critical
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    • 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 
    • D06F39/10—Filtering arrangements
    • 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
    • D06F58/00—Domestic laundry dryers
    • D06F58/20—General details of domestic laundry dryers 
    • D06F58/22—Lint collecting arrangements
    • 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
    • D06F39/087—Water level measuring or regulating devices

Definitions

  • the invention relates to a household appliance, such as a washing machine or a laundry dryer, having a filter and an indicator means to indicate the obstructed state of the filter, a sensing device, sensing on a parameter, which during operation of the appliance obtains an abnormal value, when the filter is obstructed, the sensing device being connected to the indicator means in series by a switch for switching it on as soon as it determines that the filter is obstructed, whereby the indicator means is connected to the main power supply, so that it remains switched on even if any other parts of the appliance, due to the obstructed state of the filter are switched off.
  • a household appliance such as a washing machine or a laundry dryer
  • Known laundry washers and laundry dryers are usually equipped with filters for retaining particulate impurities and/or solid bodies entrained in the washing liquid, or for retaining loose fibers and fluff, respectively, entrained by the drying air flow circulating through the dryer.
  • the associated filter is progressively obturated by the particulate impurities or solid bodies, or by loose fibers and fluff, respectively, until it is finally completely clogged, so that an effective filtering action is no longer obtained, resulting in unsatisfactory operation of the respective machine.
  • the known machines are provided with suitable monitoring devices associated with the respective filter for giving timely indication of the clogged state of the filter and thus of its need of being cleaned.
  • a known filter monitoring device for a laundry dryer comprises a thermostat disposed downstream of the filter with respect to the direction of circulation of the drying air and operatively connected to an indicator lamp visible at the control panel of the machine and adapted to indicate the operative state of the filter.
  • the thermostat senses the temperature of the drying air circulating downstream of the filter, and is calibrated to control the energization of the indicator lamp in the presence of excessively high air temperatures resulting from the reduction of the air flow caused by the complete obturation of the filter by loose fibers and fluff.
  • This monitoring device suffers from the disadvantage, however, that it is automatically deenergized as soon as the machine itself is deenergized at the end of the laundry drying cycle or in response to faulty operation eventually necessitating maintenance operations to be carried out on the machine. Under these circumstances the indicator lamp of the known monitoring device is thus likewise deenergized, so that the indication of the operative state of the filter is not maintained operative to advise the user that suitable action should be taken. It would therefore be desirable, to provide a filter monitoring device for a laundry washer or laundry dryer capable of indicating the operative state of the filter irrespective of whether or not the respective machine is in operation.
  • US-A-2 950 539 describes a laundry dryer with a signalling device indicating when the lint filter is clogged and needs to be removed for cleaning.
  • This signalling device has a timer in connection with a cam and a holding relay, which is controlled by the timer. If the entire drying process takes an undue long time due to the obstructed filter, the timer energizes the relay which actuates a warning lamp to indicate that the filter is to be cleaned.
  • EP-A-1-028 067 describes a washing machine which includes a detector to indicate that the filter is obstructed.
  • a low-level water sensor used during normal operation of the machine for normal control of the machine is monitored during the drainage operation and the controller is arranged to establish whether the water sensor has operated a predetermined time after the drain pump is started. If the switch does not change state, then it is assumed that the filter is blocked and, either immediately or at the end of the wash program a warning light is illuminated.
  • This control needs a complicated microprocessor circuit.
  • US-A-2 903 799 relates to a laundry dryer which includes a temperature sensitive switch in close thermal connection to the heater resistance.
  • the temperature sensitive switch ingnites a warning lamp to indicate that the filter is obstructed.
  • This solution may deliver a very rapid response on an undue rise in the temperature of the heating unit which, however, may not necessarily be based on a clogged filter.
  • DE-A-21 35 932 refers to a laundry dryer with an indicator lamp which is switched on in case that the filter is clogged.
  • pressure sensors are provided upstream and downstream of the filter and the differential pressure switch is actuated as soon as the difference in pressures becomes undue high.
  • the invention as claimed intends to provide for a household appliance, such as a washing machine or a laundry dryer which has a simple and efficient monitoring device to indicate that the filter is obstructed. Furthermore, this monitoring device should also be in operation even when the machine has already been switched off by the program.
  • a filter monitoring device for use in a laundry washing machine of a conventional type, including a filter (not shown) associated with the discharge pump (not shown) and discharge pipe of the machine for retaining any foreign bodies entrained by the washing liquid.
  • the laundry washing machine further includes a pressure switch 7 or the like connected to the electric circuit of the machine for controlling the filling level of the washing liquid in the washing tub (not shown).
  • Pressure switch 7 includes a movable contact 8 connected to a supply conductor 9 of the machine and adapted to selectively close on fixed contacts 10 and 11 of the pressure switch, said fixed contacts being connected to conventional components (not shown) of the electric circuit of the machine.
  • movable contact 8 In its first operative position movable contact 8 is caused to close on fixed contact 10 when the tub of the machine is empty or filled with a washing liquid to a level below that to which pressure switch 7 is calibrated.
  • movable contact 8 In its second operative position movable contact 8 is caused to close on a fixed contact 11 when the tub is filled with the washing liquid to the level to which pressure switch 7 is calibrated.
  • the pressure switch 7 is connected between the supply conductors 9 and 12 of the electric circuit of the machine, with the interposition of an electric circuit breaker 13 being connected in series with an electric resistance 22 cooperating with a movable contact 23 of a manually resettable thermostat of conventional construction.
  • Movable contact 23 is adapted to close a circuit including an indicator lamp 16 for the indication of the operative state of the filter and connected between supply conductors 9 and 12 in parallel to the circuit including pressure switch 7, circuit breaker 13 and resistance 22.
  • Movable contact 23 is of the normally open type and adapted to be shifted to its closed state by its thermal expansion in response to the heating of resistance 22 when the latter is being energized by the closing of circuit breaker 13 with movable contact 8 of pressure switch 7 still closed an fixed contact 11.
  • Closing of main switch 21 prepares the washing machine for carrying out a selected program under the control of the program control unit of the machine, and initiated by the admission of the washing liquid to the tub to the charging level determined by pressure switch 7, at which level movable contact 8 of pressure switch 7 is caused to close on fixed contact 11.
  • the washing liquid is discharged from the tub by means of the discharge pump causing it to pass through the filter and the discharge pipe (none of these components being shown in the drawing).
  • the discharge operation is carried out within a relatively short time, while requiring a noticeably longer period of time when the filter is obstructed.
  • movable contact 8 of pressure switch 7, which at the beginning of the discharge operation is still closed on fixed contact 11, will be caused to close on fixed contact 10 after a predetermined period of time during which the tub of the machine has been emptied to a lower liquid level, provided that the filter is not obstructed.
  • movable contact 8 will be caused to close on fixed contact 10 after a period of time which is longer than that specified above.
  • the respective cam of the program control unit of the machine operates to close electric circuit breaker 13 of the filter monitoring device at the end of the above specified short period of time.
  • the movable contact can only be returned to its open state to extinguish indicator lamp 16 by manually resetting the thermostat after the filter has been cleaned or replaced.
  • indicator lamp 16 may be supplemented or replaced by other indicator devices of conventional type, for instance by an acoustic warning device connected to the electric circuit in the same manner as described.
  • the thus constructed monitoring device is adapted to have a voltage applied thereto in response to the closing of a main switch 21 of the machine connected to the above described supply conductors 9 and 12.
  • the device shown in Fig 2 on its part is composed of the same electric components as the device of Fig 1, which are therefore designated by the sane reference numerals, with the exception of the pressure switch, which in this case is replaced by a thermostat 42, disposed downstream of the filter in the flow direction of the circulating drying air.
  • the thermostat 42 has a movable contact 43 of the normally open type, which remains in its open position as long as the filter is not obstructed.
  • resistance 22 obtains an undue high temperature and then closes movable contact 23 which switches an the indicator lamp 16.
  • Switch 23 as in the embodiment of Fig 1 can only be reset manually.

Claims (3)

  1. Appareil domestique, tel qu'une machine à laver ou un sèche-linge, ayant un filtre et des moyens d'indication (16) pour indiquer l'état de colmatage du filtre, un dispositif de détection (7,13,22;42,22), détectant un paramètre qui prend une valeur anormale pendant le fonctionnement de l'appareil lorsque le filtre est colmaté, le dispositif de détection étant relié en série aux moyens d'indication (16) par un interrupteur (23) pour mettre sous tension les moyens d'indication dès que le dispositif de détection détermine que le filtre est colmaté, les moyens d'indication étant reliés à l'alimentation électrique du réseau (9,12) de façon à rester sous tension même si tous les autres composants de l'appareil sont mis hors tension du fait de l'état de colmatage du filtre, caractérisé en ce que le dispositif de détection comporte un commutateur (7,13;42) monté en série avec une résistance (22) qui est chauffée anormalement lorsque le filtre est colmaté et en ce que l'interrupteur (23), monté en série avec les moyens d'indication (16), est un interrupteur thermosensible en liaison thermique avec la résistance (22) pour mettre sous tension les moyens d'indication (16) lorsque la résistance (22) atteint une température anormale.
  2. Machine à laver selon la revendication 1, ayant un interrupteur programmé (13) en série avec un mano-contact (7) qui détecte le niveau de l'eau dans la machine, caractérisée en ce que la résistance (22) est montée en série avec l'interrupteur programmé (13)et avec le mano-contact (7) pour être mise sous tension lorsque l'interrupteur programmé (13) et le mano-contact (7) sont tous deux fermés et pour atteindre une température anormale lorsque l'intervalle de temps entre la mise en route de la pompe de vidange de la machine par l'interrupteur programmé (13) et l'ouverture du manocontact (lorsque le niveau de l'eau est tombé en dessous d'une valeur prédéterminée)est excessivement long.
  3. Sèche-linge selon la revendication 1, caractérisé en ce que le dispositif de détection comporte un interrupteur thermosensible (42) disposé à l'intérieur d'une chambre en aval du filtre pour détecter la température de l'air de séchage en circulation, et monté en série avec la résistance (22) pour mettre sous tension cette résistance (22) lorsque la température de l'air de séchage atteint une valeur anormale.
EP87107068A 1986-05-16 1987-05-15 Dispositif de contrôle de filtre pour un appareil électroménager Expired - Lifetime EP0245870B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT45726/86A IT1192081B (it) 1986-05-16 1986-05-16 Dispositivo di controllo del filtro per apparecchi elettrodomestici
IT4572686 1986-05-16

Publications (2)

Publication Number Publication Date
EP0245870A1 EP0245870A1 (fr) 1987-11-19
EP0245870B1 true EP0245870B1 (fr) 1991-09-11

Family

ID=11257771

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87107068A Expired - Lifetime EP0245870B1 (fr) 1986-05-16 1987-05-15 Dispositif de contrôle de filtre pour un appareil électroménager

Country Status (4)

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EP (1) EP0245870B1 (fr)
DE (1) DE3772839D1 (fr)
ES (1) ES2025578T3 (fr)
IT (1) IT1192081B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3930727A1 (de) * 1989-09-14 1991-03-28 Miele & Cie Anordnung und verfahren zur verschmutzungsgradueberwachung und -anzeige eines flusenfilters und/oder waermetauschers in einem waeschetrockner
IT1289375B1 (it) * 1996-05-14 1998-10-02 Electrolux Zanussi Elettrodome Macchina lavabiancheria con filtro controllato
US6785981B1 (en) 2003-02-19 2004-09-07 In-O-Vate Technologies Restriction detecting systems for clothes dryer exhaust systems
CN113786653B (zh) * 2021-10-29 2022-10-25 珠海格力电器股份有限公司 一种净水设备及其控制方法及控制装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2903799A (en) * 1955-06-21 1959-09-15 Philco Corp Drying apparatus
US2950539A (en) * 1957-10-10 1960-08-30 Borg Warner Clothes dryer
DE2135932A1 (de) * 1971-07-15 1973-01-25 Siemens Elektrogeraete Gmbh Nach dem trommelprinzip mit luftumwaelzung arbeitender waeschetrockner
EP0028067A1 (fr) * 1979-09-12 1981-05-06 Kenwood Manufacturing Company Limited Machine à laver avec indicateur d'engorgement de drainage

Also Published As

Publication number Publication date
EP0245870A1 (fr) 1987-11-19
DE3772839D1 (de) 1991-10-17
ES2025578T3 (es) 1992-04-01
IT8645726A0 (it) 1986-05-16
IT1192081B (it) 1988-03-31

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