EP0748607B1 - Vorrichtung zum Überwachen des Filterwaschens bei einer Geschirrspülmaschine - Google Patents

Vorrichtung zum Überwachen des Filterwaschens bei einer Geschirrspülmaschine Download PDF

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Publication number
EP0748607B1
EP0748607B1 EP96830337A EP96830337A EP0748607B1 EP 0748607 B1 EP0748607 B1 EP 0748607B1 EP 96830337 A EP96830337 A EP 96830337A EP 96830337 A EP96830337 A EP 96830337A EP 0748607 B1 EP0748607 B1 EP 0748607B1
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EP
European Patent Office
Prior art keywords
valve
washing
dishwasher
nozzles
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
EP96830337A
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English (en)
French (fr)
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EP0748607A2 (de
EP0748607A3 (de
Inventor
Roberto Bertazzoni
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.)
Smeg SpA
Original Assignee
Smeg SpA
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Filing date
Publication date
Application filed by Smeg SpA filed Critical Smeg SpA
Publication of EP0748607A2 publication Critical patent/EP0748607A2/de
Publication of EP0748607A3 publication Critical patent/EP0748607A3/de
Application granted granted Critical
Publication of EP0748607B1 publication Critical patent/EP0748607B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • A47L15/4202—Water filter means or strainers
    • A47L15/4208—Arrangements to prevent clogging of the filters, e.g. self-cleaning
    • 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
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0049—Detection or prevention of malfunction, including accident prevention

Definitions

  • the present invention relates to devices which make part of a dishwasher, and in particular to a device for controlling the washing of the filter of a dishwasher.
  • a dishwasher includes filters on the tank floor for the capture of the dirt particles which are removed from the dishes during the washing, in order to prevent said particles from circulating back in the washing water and possibly depositing again on the dishes.
  • filters on the tank floor for the capture of the dirt particles which are removed from the dishes during the washing, in order to prevent said particles from circulating back in the washing water and possibly depositing again on the dishes.
  • a first large-mesh filter is provided for capturing the large-size particles
  • microfilter second close-mesh filter
  • the washing cycle includes several phases of loading and discharging water in the dishwasher tank, it is advisable that at each clean water loading the filters are ready to capture as many particles as possible, in order to increase the washing effectiveness. It is clear that the achievement of this result requires the filters to be cleaned at best, because if they are clogged they can not properly carry out their filtering function.
  • cleaning nozzles are usually provided in a branch from the duct which feeds the water to the lower sprinkler. These nozzles eject counter-current jets which wash the microfilter, thus removing the dirt particles accumulated thereon.
  • Such a continuous microfilter cleaning operation keeps it always in perfect working order, but also has the drawback that the dirt is recirculated during the washing step.
  • the microfilter is connected at the bottom with a discharge space through which the dirt is eliminated when the suction pump of the drain is activated. Therefore, when the drain pump is at rest and the discharge space is filled with water, the dirt removed from the microfilter can recirculate due to the high turbulence on the tank floor caused by the continuous water recirculation. This does not occur to large-size particles, captured by the large-mesh filter, owing to their much greater weight.
  • a conventional solution for limiting the cleaning of the microfilter to specific periods during the washing cycle is the use of an electromechanical control device.
  • Such a device usually includes an electrovalve controlled by a pressure switch, so as to close the branch which feeds the water to the cleaning nozzles when the feed pressure reaches a pre-established value.
  • the object of the present invention is to provide a device for controlling the microfilter washing which is suitable to overcome the above-mentioned drawbacks.
  • a first essential advantage of the device according to the present invention is that it is extremely simple and completely mechanical, with positive consequences of lower cost, both for the production and installation, and absolute reliability.
  • a second advantage of said device comes from the fact that it is automatic, i.e. it is directly activated by the feed pressure without requiring a specific member for detecting said pressure.
  • a dishwasher includes, as mentioned above, a large-mesh filter 1 and a microfilter 2 concentric thereto and revolving around the common axis X. Said filters are located on the floor of tank 3 and in communication with a lower discharge space 4. The water coming from the hydraulic network is loaded into the tank, and from here it is then sucked up by a washing pump which feeds it under pressure into the washing circuit through a feed duct 5.
  • a cleaning duct 6 branches out from said duct 5 and terminates with some washing nozzles 7, which throw tangential jets on microfilter 2 for cleaning it while putting it into rotation, so as to act on its whole surface.
  • a first embodiment of the control device according to the present invention located at the beginning of branch 6, is illustrated in detail in the enlargement of fig.2.
  • the device includes a vertical gate valve 8 on whose stem, outside from branch 6, a spring 9 is inserted between the seat of valve 8 and the hemispherical lower end 10 of the stem. Said end 10 is in contact with a lever 11, pivoted onto a support 12, whose opposite end is in turn in contact with the hemispherical lower end 13 of a small rod 14.
  • This rod 14 is provided with a small top plate 15 and a bottom annular rim 16, which define the limits of the vertical displacement of rod 14 within a seat formed in support 12.
  • the device includes a flexible membrane 17 which closes an opening, concentric with rod 14, formed in the wall of the cleaning duct 6.
  • the operation of the above-mentioned device is very simple and reliable, in that it is based on the water feed pressure.
  • the increase of the water level in the tank and therefore of the pressure at which the water is circulated by the washing pump, which sucks up less and less air, causes also the force exerted on the small plate 15 through membrane 17 to increase in proportion.
  • nozzles 7 clean microfilter 2 and, thanks to the reduced turbulence in the tank, the dirt particles can fall into the discharge space 4 which is progressively filled.
  • a second embodiment of the device according to the present invention is now illustrated with reference to figs.3, 4, 5a and 5b.
  • the device is located in branch 6 also in this case, but at the bottom of tank 3 rather than near duct 5.
  • the same bottom of tank 3 is shaped so as to form a lower chamber 19 and an upper rim onto which an annular ring nut 20 is locked.
  • the latter is integral with and end tube 21, in which the cleaning nozzles 7 are formed, through a plurality of ribs 22 (three in the illustrated example).
  • a central stopper 25, suitable to close the inlet of tube 21, is connected to plate 24 by means of vertical ribs 26 having a length equal to or smaller than the vertical travel of plate 24.
  • the interruption of the cleaning of microfilter 2 is caused in a simple and reliable way by the pressure reached by the washing water.
  • the water pressure when the water pressure is low, the water enters chamber 19 and goes round stopper 25 to proceed into the cleaning tube 21, as indicated by the arrows in fig.5a.
  • the water exerts its pressure on both sides of stopper 25, therefore with a null vertical resultant, but only on the lower side of plate 24, thus pushing it upwards.
  • the pressure generated by the washing pump increases along with the water level in the tank, also the pressure on plate 24 in chamber 19 will reach a value sufficient to overcome the strength of spring 23. At this moment, plate 24 will shift upwards and move along therewith, through ribs 26, the stopper 25 which stops the water flow to nozzles 7 (fig.5b).
  • valve is not of the gate type (8) but of the lift type (25), and the means for transmitting the push of the water pressure to the valve in order to overcome the strength of the spring (9, 23) consist of plate 24 with its connecting ribs 26 rather than the membrane-rod-lever mechanism (17, 14, 11) of the first embodiment.
  • valve type may be different, also of the rotating type such as a plug or butterfly valve, in said case spring 9 being of the coil type.
  • spring 9 being of the coil type.
  • the mechanism which transmits the push of water to the valve will be adapted to the type of valve, while retaining a device of the mechanical type in any member thereof.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Check Valves (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Claims (3)

  1. Geschirrspülmaschine, umfassend eine Filterspülanordnung, wobei die Filterspülanordnung umfaßt: Düsen (7), die zum Gegenstromspülen des Geschirrspülfilters (2) angeordnet sind, eine Reinigungsleitung (6) zum Speisen der Düsen (7), die von einer Speiseleitung (5) der Spülpumpe abzweigt, und ein Ventil, das geeignet ist, den Wasserstrom stromaufwärts von den Düsen (7) zu unterbrechen, dadurch gekennzeichnet, daß sie umfaßt: einen Betätigungsmechanismus (11, 12, 13, 14) und ein elastisches Element, wobei das Ventil mechanisch betätigt wird, um es gegen den Widerstand des elastischen Elements zu schließen, und eine Wasserdruckübertragungseinrichtung (17), die geeignet ist, um auf den Mechanismus (11, 12, 13, 14) die Kraft zu übertragen, die vom Druck des von der Spülpumpe eingespeisten Wassers herrührt.
  2. Geschirrspülmaschine nach Anspruch 1, dadurch gekennzeichnet, daß das elastische Element eine Feder (9) ist, und dadurch, daß das Ventil ein vertikales Absperrventil (8) mit einem Schaft ist, auf welchem Schaft die Feder (9) zwischen dem Sitz des Ventils (8) und dem unteren Ende (10) des Schafts eingesetzt ist, und dadurch, daß der Betätigungsmechanismus einen Hebel (11) einschließt, der auf einer Halterung (12) drehbar gelagert ist, wobei er auf einer Seite des Drehpunkts mit dem Ende (10) und auf der anderen Seite mit dem unteren Ende (13) einer kleinen Stange (14) in Berührung steht, die in einem in der Halterung (12) ausgebildeten Sitz vertikal bewegbar ist, wobei die Wasserdruckübertragungseinrichtung aus einer mit dem oberen Ende der Stange (14) in Berührung stehenden und dazu konzentrischen biegsamen Membran (17) besteht, die eine in der Wand der Reinigungsleitung (6) gebildete Öffnung verschließt.
  3. Geschirrspülmaschine nach Anspruch 1, dadurch gekennzeichnet, daß sie umfaßt: eine ringförmige Ringmutter (20), die auf dem oberen Rand einer auf dem Boden des Tanks (3) der Geschirrspülmaschine gebildeten Kammer (19) festgemacht ist, wobei die Ringmutter (20) mit einem Endrohr (21), in dem die Reinigungsdüsen (7) ausgebildet sind, durch eine Mehrzahl von Rippen (22) eine Einheit bildet, sowie eine Feder (23), die zwischen den Rippen (22) und einer ringförmigen Platte (24) eingeschlossen ist, welche konzentrisch zum Endrohr (21) ist und in der Kammer (19) bewegbar ist, wobei das Ventil ein Absperrventil (25) ist, das von der Platte (24) durch vertikale Rippen (26) betätigt wird, welche eine Länge aufweisen, die gleich oder kleiner ist als der vertikale Bewegungsweg der Platte (24).
EP96830337A 1995-06-14 1996-06-12 Vorrichtung zum Überwachen des Filterwaschens bei einer Geschirrspülmaschine Expired - Lifetime EP0748607B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI951271 1995-06-14
IT95MI001271A IT1276718B1 (it) 1995-06-14 1995-06-14 Dispositivo per controllare il lavaggio del filtro di una macchina lavastoviglie

Publications (3)

Publication Number Publication Date
EP0748607A2 EP0748607A2 (de) 1996-12-18
EP0748607A3 EP0748607A3 (de) 1997-05-14
EP0748607B1 true EP0748607B1 (de) 2001-03-28

Family

ID=11371811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96830337A Expired - Lifetime EP0748607B1 (de) 1995-06-14 1996-06-12 Vorrichtung zum Überwachen des Filterwaschens bei einer Geschirrspülmaschine

Country Status (4)

Country Link
EP (1) EP0748607B1 (de)
DE (1) DE69612236T2 (de)
ES (1) ES2156268T3 (de)
IT (1) IT1276718B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10314458B2 (en) 2017-03-28 2019-06-11 Haier Us Appliance Solutions, Inc. Fluid circulation system for dishwasher appliances and related methods
US11241138B2 (en) 2017-03-16 2022-02-08 Haier Us Appliance Solutions, Inc. Fluid circulation system for dishwasher appliances

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1289186B1 (it) * 1997-01-22 1998-09-29 Smeg Spa Dispositivo di filtrazione perfezionato per macchine lavastoviglie
PL1878377T3 (pl) * 2006-07-10 2009-04-30 Bonferraro Spa Filtr do zmywarki do naczyń
US8215322B2 (en) 2008-12-22 2012-07-10 Whirlpool Corporation Dishwasher with soil removal
US8746261B2 (en) 2009-12-21 2014-06-10 Whirlpool Corporation Rotating drum filter for a dishwashing machine
US9119515B2 (en) 2010-12-03 2015-09-01 Whirlpool Corporation Dishwasher with unitary wash module
US8667974B2 (en) 2009-12-21 2014-03-11 Whirlpool Corporation Rotating filter for a dishwashing machine
US9918609B2 (en) 2009-12-21 2018-03-20 Whirlpool Corporation Rotating drum filter for a dishwashing machine
US8627832B2 (en) 2010-12-13 2014-01-14 Whirlpool Corporation Rotating filter for a dishwashing machine
US9687135B2 (en) 2009-12-21 2017-06-27 Whirlpool Corporation Automatic dishwasher with pump assembly
US9492052B2 (en) 2009-12-25 2016-11-15 Arcelik Anonim Sirketi Dishwasher comprising a microfilter
US9668636B2 (en) 2010-11-16 2017-06-06 Whirlpool Corporation Method and apparatus for dishwasher with common heating element for multiple treating chambers
US9113766B2 (en) 2010-11-16 2015-08-25 Whirlpool Corporation Method and apparatus for dishwasher with common heating element for multiple treating chambers
US9034112B2 (en) 2010-12-03 2015-05-19 Whirlpool Corporation Dishwasher with shared heater
US9107559B2 (en) 2011-05-16 2015-08-18 Whirlpool Corporation Dishwasher with filter assembly
US8733376B2 (en) 2011-05-16 2014-05-27 Whirlpool Corporation Dishwasher with filter assembly
US9265401B2 (en) 2011-06-20 2016-02-23 Whirlpool Corporation Rotating filter for a dishwashing machine
US20120318296A1 (en) 2011-06-20 2012-12-20 Whirlpool Corporation Ultra micron filter for a dishwasher
US9005369B2 (en) 2011-06-20 2015-04-14 Whirlpool Corporation Filter assembly for a dishwasher
US9010344B2 (en) 2011-06-20 2015-04-21 Whirlpool Corporation Rotating filter for a dishwashing machine
US9861251B2 (en) 2011-06-20 2018-01-09 Whirlpool Corporation Filter with artificial boundary for a dishwashing machine
US9301667B2 (en) 2012-02-27 2016-04-05 Whirlpool Corporation Soil chopping system for a dishwasher
US9237836B2 (en) 2012-05-30 2016-01-19 Whirlpool Corporation Rotating filter for a dishwasher
US9730570B2 (en) 2012-05-30 2017-08-15 Whirlpool Corporation Reduced sound with a rotating filter for a dishwasher
US9451862B2 (en) 2012-06-01 2016-09-27 Whirlpool Corporation Dishwasher with unitary wash module
US9532700B2 (en) 2012-06-01 2017-01-03 Whirlpool Corporation Dishwasher with overflow conduit
US9833120B2 (en) 2012-06-01 2017-12-05 Whirlpool Corporation Heating air for drying dishes in a dishwasher using an in-line wash liquid heater
US9554688B2 (en) 2012-10-23 2017-01-31 Whirlpool Corporation Rotating filter for a dishwasher and methods of cleaning a rotating filter

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Publication number Priority date Publication date Assignee Title
US3807419A (en) * 1972-05-12 1974-04-30 Gen Electric Dishwasher having means for collecting and removing food soil
IT1197983B (it) * 1986-11-13 1988-12-21 Candy Elettrodomestici Ciclo di lavaggio per macchine lavatrici, in particolare lavastoviglie e macchina lavatrice operante secondo tale ciclo
US5345957A (en) * 1993-09-07 1994-09-13 Maytag Corporation Dishwasher filter arrangement
DE9415486U1 (de) * 1994-09-24 1994-11-17 Bauknecht Hausgeräte GmbH, 70563 Stuttgart Geschirrspülmaschine mit einem Spülwasser-Kreislauf und einer Filtervorrichtung mit Reinigungsvorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11241138B2 (en) 2017-03-16 2022-02-08 Haier Us Appliance Solutions, Inc. Fluid circulation system for dishwasher appliances
US10314458B2 (en) 2017-03-28 2019-06-11 Haier Us Appliance Solutions, Inc. Fluid circulation system for dishwasher appliances and related methods

Also Published As

Publication number Publication date
EP0748607A2 (de) 1996-12-18
IT1276718B1 (it) 1997-11-03
ITMI951271A0 (it) 1995-06-14
ES2156268T3 (es) 2001-06-16
EP0748607A3 (de) 1997-05-14
ITMI951271A1 (it) 1996-12-14
DE69612236D1 (de) 2001-05-03
DE69612236T2 (de) 2001-08-23

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