EP0222306A1 - Geschirrspülmaschine mit selbstreinigendem Rezirkulationsfilter - Google Patents

Geschirrspülmaschine mit selbstreinigendem Rezirkulationsfilter Download PDF

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Publication number
EP0222306A1
EP0222306A1 EP86115281A EP86115281A EP0222306A1 EP 0222306 A1 EP0222306 A1 EP 0222306A1 EP 86115281 A EP86115281 A EP 86115281A EP 86115281 A EP86115281 A EP 86115281A EP 0222306 A1 EP0222306 A1 EP 0222306A1
Authority
EP
European Patent Office
Prior art keywords
filter
recirculation filter
water
jet
recirculation
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.)
Granted
Application number
EP86115281A
Other languages
English (en)
French (fr)
Other versions
EP0222306B1 (de
Inventor
Claudio Milocco
Giovanni Pup
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
Original Assignee
Industrie Zanussi SpA
Zanussi Elettrodomestici SpA
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 Industrie Zanussi SpA, Zanussi Elettrodomestici SpA filed Critical Industrie Zanussi SpA
Priority to AT86115281T priority Critical patent/ATE54560T1/de
Publication of EP0222306A1 publication Critical patent/EP0222306A1/de
Application granted granted Critical
Publication of EP0222306B1 publication Critical patent/EP0222306B1/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
    • A47L15/42—Details
    • A47L15/4202—Water filter means or strainers
    • A47L15/4204—Flat filters

Definitions

  • the present invention relates to a dishwashing machine having a recirculaticn filter adapted to be automatically cleaned during operation of the machine.
  • Known dishwashers usually have a water collection sump at the bottom of the washing chamber, with a water recirculation pump and a water discharge pump connected thereto.
  • the water collection sump communicates with the washing chamber through a fine-mesh recirculation filter of a substantially planar configuration adapted to retain particulate matter entrained by the water flowing from the chamber into the collecting sump.
  • the recirculation filter is formed with an opening through which the interior of the washing chamber communicates directly with the intake of the discharge pump.
  • a large-mesh filter inserted into this opening serves the main purpose of retaining large particles which might otherwise obstruct or damage the rotor of the discharge pump.
  • a dishwashing machine known from EU-A-0068974 is provided with rotating jet nozzles directed obliquely onto the surface of the recirculation filter for rinsing retained particulate matter off the recirculation filter and sweeping it into the pump protection filter.
  • the jet nozzles In view of their small inclination in the order of 10 to 25°, the jet nozzles have experimentally been found to practically lack any efficiency. To the contrary, the vertical components of the rotating jets tends to jam the particulate matter into the passages of the recirculation mesh filter, with the result that the filter is progressively obstructed.
  • This object is attained in a dishwasher of the type having a recirculation filter with a substantially planar surface adapted to retain particulate matter, and nozzle means adapted to direct at least one water jet onto the surface.
  • the dishwasher is characterized in that said water jet is directed substantially tangentially onto the surface of said recirculation filter.
  • the tangential water jet is preferably of the rotating type, issueing from a rotating nozzle carrier arm disposed above the recirculation filter by way of a branch outlet thereof and/or deflector means.
  • a dishwasher comprises a washing chamber 3 (only partially shown), the bottom of which is formed with a sump 4 for collecting the washing and rinsing water.
  • Located in sump 4 is the intake section 2 of a circulation pump 5 for the supply of water to at least one rotating nozzle carrier arm 6 for spraying the water onto the (not shown) dishes to be washed in the known manner.
  • Filter 7 is disposed in the flow path of the water sprayed onto the dishes and flowing back into sump 4 for being recirculated by pump 5.
  • Filter 7 is formed with a frustoconical portion housing a removable large-mesh filter 8 of a corresponding shape disposed in the flow path of the water from sump 4 to the intake of a discharge pump 9.
  • the dishwasher further comprises nozzle means adapted to direct a jet of water 11 onto the surface of recirculation filter 7 in a direction towards the center of washing chamber 3.
  • jet 11 is directed substantially tangentially onto the surface of recirculation filter 7.
  • This effect may preferably be obtained by means of a substantially annular deflector 13 extending adjacent the periphery of filter 7, itself shaped for instance as an annular sheet member concentric with the axis of rotation of nozzle carrier arm 6.
  • nozzle carrier arm 6 has its underside formed with at least one supplementary opening 10 adapted to direct a jet 14 of water onto deflector 13 shaped to deflect the water so as to form tangential jet 11, the latter being preferably aligned in the radial direction of filter 7.
  • jet 11 being substantially devoid of vertical components, does not cause the passages of filter 7 to be obstructed by the particulate matter it entrains; quite to the contrary, the particulate matter is swept along the surface of the recirculation filter substantially without hindrance and into large-mesh filter 8 to be collected therein prior to being expelled therefrom during a supsequent water discharge cycle.
  • the invention thus attains the stated object of achieving an effective automatic cleaning of recirculation filter 7 which may advantageously be of a simple construction (for example a simple metal sheet or plastic panel), and may be formed with particularly narrow passages to result in improved filtering performance.
  • the described combination results in an improvement of the overall performance of the dishwasher by achieving effective filtering of the total volume of the recirculated water instead of filtering only part of the circulating water as in conventional embodiments.
  • the particularly narrow passages of the recirculation filter facilitate the displacement of particulate matter on the surface of the filter, thus contributing to the self-cleaning effect. It has been experimentally found that the optimum dimension of the passages of filter 7 lie between 0.2 and 0.3 millimeters.
  • deflector 13 may be omitted, jet 11 being produced by a branch pipe 12 extending downwards from nozzle carrier arm 6 and being suitably shaped into an "L" configuration as shown in the drawing.
  • the described dishwasher may of course be subjected to various modifications and alterations within the scope of the invention.
  • the jet 11 issueing from supplementary opening 10 may for instance be inclined directly onto filter 7 in the known manner; in this case, however, the recirculation filter would be of substantially conical shape with its surface aligned with respect to jet 11 so that the latter impinges tangentially thereon.
  • Further jet 11 may be produced in any suitable manner to be directed from a central position of filter 7 towards its periphery, or any number of such jets may be produced by a corresponding number of stationary nozzles in place of rotating ones.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Detergent Compositions (AREA)
EP86115281A 1985-11-13 1986-11-04 Geschirrspülmaschine mit selbstreinigendem Rezirkulationsfilter Expired - Lifetime EP0222306B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86115281T ATE54560T1 (de) 1985-11-13 1986-11-04 Geschirrspuelmaschine mit selbstreinigendem rezirkulationsfilter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8534100U IT209170Z2 (it) 1985-11-13 1985-11-13 Macchina lavastoviglie con filtro di ricircolo autopulente.
IT3410085U 1985-11-13

Publications (2)

Publication Number Publication Date
EP0222306A1 true EP0222306A1 (de) 1987-05-20
EP0222306B1 EP0222306B1 (de) 1990-07-18

Family

ID=11239249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115281A Expired - Lifetime EP0222306B1 (de) 1985-11-13 1986-11-04 Geschirrspülmaschine mit selbstreinigendem Rezirkulationsfilter

Country Status (5)

Country Link
EP (1) EP0222306B1 (de)
AT (1) ATE54560T1 (de)
DE (1) DE3672751D1 (de)
ES (1) ES1000793Y (de)
IT (1) IT209170Z2 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0317990A1 (de) * 1987-11-26 1989-05-31 Abb Cylinda Ab Verfahren zum Selbstreinigen von Ablaufsystemen in einer Reinigungsmaschine, insbesondere einer Geschirrspülmaschine und Vorrichtung zur Durchführung des Verfahrens
WO1991008700A1 (en) * 1989-12-20 1991-06-27 Vulcan Australia Limited Filter screen assembly for dishwasher
EP0852928A2 (de) * 1996-12-16 1998-07-15 Whirlpool Corporation Geschirrspülmaschine mit einem Ober- und Untersprüharm, einer Umwälzpumpe und einer Entleerungspumpe
DE19702982A1 (de) * 1997-01-28 1998-08-13 Whirlpool Co Geschirrspülmaschine mit unterem und oberem Sprüharm sowie mit Umwälzpumpe und Laugenpumpe
US6001190A (en) * 1995-04-06 1999-12-14 General Electric Company Reduced energy cleaning appliance
AU771909B2 (en) * 2000-12-14 2004-04-08 Lg Electronics Inc. Dishwasher

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129711A (en) * 1960-09-29 1964-04-21 Gorman Rupp Ind Inc Dishwasher recirculating assembly
FR2302071A1 (fr) * 1975-02-26 1976-09-24 Licentia Gmbh Machine a laver la vaisselle
DE2555153A1 (de) * 1975-12-08 1977-06-23 Licentia Gmbh Geschirrspuelmaschine
US4038103A (en) * 1976-07-27 1977-07-26 Hobart Corporation Dishwasher filter flushing system
EP0068974A1 (de) * 1981-06-30 1983-01-05 Esswein S.A. Geschirrspüler mit selbstreinigendem Sieb
EP0150478B1 (de) * 1984-01-05 1990-07-18 INDUSTRIE ZANUSSI S.p.A. Geschirrspüler mit selbstreinigendem Pumpenschutzfilter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129711A (en) * 1960-09-29 1964-04-21 Gorman Rupp Ind Inc Dishwasher recirculating assembly
FR2302071A1 (fr) * 1975-02-26 1976-09-24 Licentia Gmbh Machine a laver la vaisselle
DE2555153A1 (de) * 1975-12-08 1977-06-23 Licentia Gmbh Geschirrspuelmaschine
US4038103A (en) * 1976-07-27 1977-07-26 Hobart Corporation Dishwasher filter flushing system
EP0068974A1 (de) * 1981-06-30 1983-01-05 Esswein S.A. Geschirrspüler mit selbstreinigendem Sieb
EP0150478B1 (de) * 1984-01-05 1990-07-18 INDUSTRIE ZANUSSI S.p.A. Geschirrspüler mit selbstreinigendem Pumpenschutzfilter

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0317990A1 (de) * 1987-11-26 1989-05-31 Abb Cylinda Ab Verfahren zum Selbstreinigen von Ablaufsystemen in einer Reinigungsmaschine, insbesondere einer Geschirrspülmaschine und Vorrichtung zur Durchführung des Verfahrens
US5097855A (en) * 1987-11-26 1992-03-24 Abb Cylinda Ab Method for self-cleaning of a strainer system in a dishwasher and a dish-washer having means for carrying out the method
WO1991008700A1 (en) * 1989-12-20 1991-06-27 Vulcan Australia Limited Filter screen assembly for dishwasher
US6001190A (en) * 1995-04-06 1999-12-14 General Electric Company Reduced energy cleaning appliance
US6343611B1 (en) 1995-04-06 2002-02-05 General Electric Company Reduced energy cleaning appliance
EP0852928A2 (de) * 1996-12-16 1998-07-15 Whirlpool Corporation Geschirrspülmaschine mit einem Ober- und Untersprüharm, einer Umwälzpumpe und einer Entleerungspumpe
EP0852928A3 (de) * 1996-12-16 1999-01-27 Whirlpool Corporation Geschirrspülmaschine mit einem Ober- und Untersprüharm, einer Umwälzpumpe und einer Entleerungspumpe
DE19702982A1 (de) * 1997-01-28 1998-08-13 Whirlpool Co Geschirrspülmaschine mit unterem und oberem Sprüharm sowie mit Umwälzpumpe und Laugenpumpe
DE19702982C2 (de) * 1997-01-28 1998-12-03 Whirlpool Co Geschirrspülmaschine mit unterem und oberem Sprüharm sowie mit Umwälzpumpe und Laugenpumpe
AU771909B2 (en) * 2000-12-14 2004-04-08 Lg Electronics Inc. Dishwasher

Also Published As

Publication number Publication date
ES1000793U (es) 1988-03-16
IT209170Z2 (it) 1988-09-16
IT8534100V0 (it) 1985-11-13
ATE54560T1 (de) 1990-08-15
EP0222306B1 (de) 1990-07-18
ES1000793Y (es) 1988-11-16
DE3672751D1 (de) 1990-08-23

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