EP0963732A1 - Lave-vaisselle avec moyens améliorés de filtration - Google Patents

Lave-vaisselle avec moyens améliorés de filtration Download PDF

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Publication number
EP0963732A1
EP0963732A1 EP99108182A EP99108182A EP0963732A1 EP 0963732 A1 EP0963732 A1 EP 0963732A1 EP 99108182 A EP99108182 A EP 99108182A EP 99108182 A EP99108182 A EP 99108182A EP 0963732 A1 EP0963732 A1 EP 0963732A1
Authority
EP
European Patent Office
Prior art keywords
level
water
dishwashing machine
bell
soil particles
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.)
Withdrawn
Application number
EP99108182A
Other languages
German (de)
English (en)
Inventor
Ugo Favret
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.)
Electrolux Zanussi SpA
Original Assignee
Electrolux Zanussi 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 Electrolux Zanussi SpA filed Critical Electrolux Zanussi SpA
Publication of EP0963732A1 publication Critical patent/EP0963732A1/fr
Withdrawn legal-status Critical Current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
    • A47L15/4206—Tubular filters

Definitions

  • Dishwashing machines are known to usually comprise a recirculation filter arranged in the path of a flow of water that is taken in by a recirculating pump to therewith supply washload spraying means.
  • such a filter includes a substantially frusto-conical portion with an aperture connecting the interior of the washing vessel with the intake of a draining pump.
  • the filter also comprises a substantially cylindrical or frusto-conical portion that extends downwards from said aperture.
  • the level of the water on the bottom of the washing vessel is generally known to lower from a "static" value to a “dynamic” value, whereas it rises again to its above mentioned static value when the recirculating pump is de-energized, ie. does not operate, such as this occurs for instance during the pauses that may be provided during the washing phase.
  • a dishwasher is known from the German utility model application no. G 295 18 990.8, whose washing vessel is provided on the bottom with a float-type non-return valve adapted to prevent the washing circuit of the machine from being affected by the soiled water flowing back from the draining circuit at the end of a draining phase.
  • the dishwashing machine can be noticed to be provided with a washing vessel 4 (shown only partially) associated to a draining circuit comprising mainly a draining pump 5 with therewith associated intake pipe 6 and delivery pipe 7.
  • the vessel 4 is provided at its lower portion with a sump 8 for collecting the wash and rinse water, wherein the intake section 9 of a washing or recirculating pump 10 communicates with the bottom of said sump.
  • Said recirculating pump is in turn adapted to supply at least a rotating spray arm 11, or similar means, to cause the washload to be thereby sprayed in a per sè known manner.
  • said vessel 4 also houses a recirculation filter 12 arranged in the path of a flow of water that is taken in by the pump 10 to be then sprayed onto the washload items through the rotating spray arm 11, when said water collects then again by gravity into the sump 8.
  • the filter 12 comprises a substantially plane portion (which preferably is slightly frusto-conical in its shape) having a ring 14 through which it blends into a substantially cylindrical (or frusto-conical) portion 15 that extends downwards until it reaches a wall 25.
  • the latter is arranged to flow into the intake pipe 6 of the draining pump 5.
  • the portions 13 and 15 of the recirculation filter are substantially concentric to the axis of rotation of the rotating spray arm 11, while a coarse-meshed filter (not shown for reasons of greater simplicity) is arranged inside said cylindrical portion 15 to protect the draining pump.
  • the washing vessel 4 is adapted to be supplied with water that collects into the sump 8 up to a static level S ( Figure 1) that it reaches when the recirculating pump 10 is not operating.
  • the pump 10 When the pump 10 is on the contrary operating so as to carry out, say, a washing phase, the water in the sump 8 is taken in by the same pump 10 so as to be then able to be sprayed on to the wasload items, through the rotating spray arm 11, thereby removing both relatively light soil particles 16 and relatively heavy soil particles 17 therefrom. As a result, the level of the water in the sump 8 decreases to a dynamic value D, as shown in Figure 2.
  • the dishwashing machine is of the type adapted to carry out washing phases through a sequence of interrupted operations of the pump 10, such as described for instance in EP-B-0 237 994 or EP-A-0 659 381.
  • the dishwashing machine comprises trap-like means 18 adapted to substantially retain the soil particles suspended in the water and to prevent the so trapped soil particles from being again taken in, ie. flushed by the flow of water that passes through the recirculation filter 12.
  • said trap-like means 18 comprise at least a substantially bell-shaped element that is arranged upstream of the filter 12, with which they form at least a hollow space 19 communicating with the draining circuit 6, 7. Furthermore, said bell-shaped element 18 has an open base 20 situated at a level B which is lower than said dynamic level D ( Figure 2), as well as a substantially closed top portion 21 that is preferably situated at a level that is higher than said static level S. The bell-shaped element 18 is also provided with venting means 22 that are preferably arranged in correspondence of said top portion 21 and are situated at a higher level than said static level S.
  • the rotating spray arm 11 is provided with auxiliary nozzles 23 and 24 which, when the recirculating pump 10 is operating, are adapted to direct onto the portions 13 and 15 of the filter respective tangential water jets adapted to perform an automatic cleaning of said filter, as this is for instance described in GB-B-2 204 482.
  • the pump 10 takes in a flow of water that, starting from the vessel 4, passes through the recirculation filter 12 and is delivered to the rotating spray arm 11.
  • the soil particles 16 and 17 removed from the washload items are brought into a suspended state in the water that flows to collect again into the sump 8, and are filtered out by the filter 12.
  • said particles tend to fall to the bottom, towards the pipe 6 of the draining pump 5, by passing through the hollow space 19 within the cylindrical portion 15 of the filter.
  • This is also due to the action of the water jet issued by the auxiliary nozzle 24.
  • a part of the soil particles tend then to remain in suspension in the water so collected in the sump 8, downstream of the hollow space 19.
  • said floating soil particles are substantially trapped, downstream of the hollow space 19, in the upper inner portion of the bell-shaped element 18, in which the water is able to freely rise again up to the static level S thanks to the presence of the vent 22.
  • the soil particles trapped in the element 18 does no longer have to be filtered by the filter 12, whose effectiveness and cleanliness are in this manner substantially improved. This of course translates into a corresponding improvement in the performance of the whole dishwashing machine.
  • the dishwashing machine according to the present invention does not require any additional moving member in contact with the soil, such as for instance a valve, so that the dishwashing machine itself proves also particularly reliable in the course of the time.
  • the operation cycle of the machine terminates of course with a usual phase of operation of the drain pump 5, so that all soil particles 16, 17 are drained off through the pipe 7 along with the water contained in the washing vessel 4.
  • the afore described dishwashing machine may be the subject of a number of modifications without departing from the scope of the present invention. So, for instance, the conformation and/or the arrangement of the recirculating filter 12 may be varied to better comply with differing requirements and needs.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Filters For Electric Vacuum Cleaners (AREA)
  • Food-Manufacturing Devices (AREA)
  • Filtering Materials (AREA)
EP99108182A 1998-06-10 1999-04-26 Lave-vaisselle avec moyens améliorés de filtration Withdrawn EP0963732A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPN980033 IT245315Y1 (it) 1998-06-10 1998-06-10 Lavastoviglie con mezzi di filtraggio perfezionati
ITPN980033U 1998-06-10

Publications (1)

Publication Number Publication Date
EP0963732A1 true EP0963732A1 (fr) 1999-12-15

Family

ID=11395374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99108182A Withdrawn EP0963732A1 (fr) 1998-06-10 1999-04-26 Lave-vaisselle avec moyens améliorés de filtration

Country Status (2)

Country Link
EP (1) EP0963732A1 (fr)
IT (1) IT245315Y1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU768976B2 (en) * 2001-05-07 2004-01-15 Lg Electronics Inc. Passage structure of dishwasher
EP1649797A1 (fr) * 2004-10-20 2006-04-26 Electrolux Home Products Corporation N.V. Lave-vaiselle et procédé de fonctionnement correspondant
EP1882438A1 (fr) * 2006-07-28 2008-01-30 Miele & Cie. KG Procédé destiné à la réalisation d'un programme de nettoyage avec une phase de nettoyage d'un filtre
EP2074921A3 (fr) * 2002-02-28 2009-08-12 Whirpool Corporation Filtre de criblage pour dispositif conducteur de liquide, en particulier lave-vaisselle
EP2179685A1 (fr) * 2008-10-23 2010-04-28 Electrolux Home Products Corporation N.V. Lave-vaisselle
CN108498046A (zh) * 2017-02-27 2018-09-07 伊莱克斯商用电器有限公司 洗碗机器

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378493A1 (fr) * 1977-01-28 1978-08-25 Licentia Gmbh Dispositif equipant des lave-vaisselle pour permettre de filtrer l'eau de lavage
GB2204482A (en) * 1987-04-08 1988-11-16 Zanussi A Spa Industrie Dishwashing machine with filter cleaning arrangement
GB2254542A (en) * 1991-04-08 1992-10-14 Zanussi Elettrodomestici Dishwashing machine with self-cleaning recirculation filter
EP0546922B1 (fr) * 1991-12-10 1997-04-23 Esswein S.A. Lave-vaisselle à filtre de liquide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378493A1 (fr) * 1977-01-28 1978-08-25 Licentia Gmbh Dispositif equipant des lave-vaisselle pour permettre de filtrer l'eau de lavage
GB2204482A (en) * 1987-04-08 1988-11-16 Zanussi A Spa Industrie Dishwashing machine with filter cleaning arrangement
GB2254542A (en) * 1991-04-08 1992-10-14 Zanussi Elettrodomestici Dishwashing machine with self-cleaning recirculation filter
EP0546922B1 (fr) * 1991-12-10 1997-04-23 Esswein S.A. Lave-vaisselle à filtre de liquide

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU768976B2 (en) * 2001-05-07 2004-01-15 Lg Electronics Inc. Passage structure of dishwasher
EP2074921A3 (fr) * 2002-02-28 2009-08-12 Whirpool Corporation Filtre de criblage pour dispositif conducteur de liquide, en particulier lave-vaisselle
EP1649797A1 (fr) * 2004-10-20 2006-04-26 Electrolux Home Products Corporation N.V. Lave-vaiselle et procédé de fonctionnement correspondant
WO2006045374A1 (fr) * 2004-10-20 2006-05-04 Electrolux Home Products Corporation N.V. Lave-vaisselle et procede pour sa mise en oeuvre
EP1882438A1 (fr) * 2006-07-28 2008-01-30 Miele & Cie. KG Procédé destiné à la réalisation d'un programme de nettoyage avec une phase de nettoyage d'un filtre
EP2179685A1 (fr) * 2008-10-23 2010-04-28 Electrolux Home Products Corporation N.V. Lave-vaisselle
WO2010046056A1 (fr) * 2008-10-23 2010-04-29 Electrolux Home Products Corporation N.V. Lave-vaisselle
CN102215729B (zh) * 2008-10-23 2013-10-16 伊莱克斯家用产品公司 洗碗机
AU2009306754B2 (en) * 2008-10-23 2013-10-24 Electrolux Home Products Corporation N.V. Dishwasher
US9955847B2 (en) 2008-10-23 2018-05-01 Electrolux Home Products Corporation, N.V. Dishwasher
CN108498046A (zh) * 2017-02-27 2018-09-07 伊莱克斯商用电器有限公司 洗碗机器

Also Published As

Publication number Publication date
IT245315Y1 (it) 2002-03-20
ITPN980033U1 (it) 1999-12-10

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