EP0150478B1 - Dishwashing machine with self-cleaning pump protection filter - Google Patents

Dishwashing machine with self-cleaning pump protection filter Download PDF

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Publication number
EP0150478B1
EP0150478B1 EP84116142A EP84116142A EP0150478B1 EP 0150478 B1 EP0150478 B1 EP 0150478B1 EP 84116142 A EP84116142 A EP 84116142A EP 84116142 A EP84116142 A EP 84116142A EP 0150478 B1 EP0150478 B1 EP 0150478B1
Authority
EP
European Patent Office
Prior art keywords
mesh filter
coarse
filter
jet
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
EP84116142A
Other languages
German (de)
French (fr)
Other versions
EP0150478A1 (en
Inventor
Claudio Milocco
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
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 filed Critical Industrie Zanussi SpA
Priority to AT84116142T priority Critical patent/ATE54559T1/en
Publication of EP0150478A1 publication Critical patent/EP0150478A1/en
Application granted granted Critical
Publication of EP0150478B1 publication Critical patent/EP0150478B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

  • the present invention relates to a dishwashing machine provided with a discharge pump protection filter adapted to be automatically cleaned during operation of the machine, as set forth in the preamble of claim 1.
  • This dishwashing machine known from IT-A-952 947 comprises a water collection well at the bottom of a washing tub, with the inlet of a water circulation pump and the inlet of a water discharge pump connected to said well.
  • the water collection well houses a fine-mesh recirculation filter disposed in the flowpath of the water aspirated by the circulation pump.
  • the fine-mesh filter is formed with an opening directly connecting the interior of the tub with the inlet of the discharge pump. Disposed in this opening is a coarse mesh filter, referred to as a discharge pump protection filter and having as its main purpose the retention of coarse impurities, such as bits of china or glass, bones and the like which might otherwise obstruct or even damage the discharge pump.
  • the coarse-mesh pump protection filter will of course also retain shreds and bits of softer materials, such as paper shreds, breadcrumbs, fatty matter and the like, which may in the long run obstruct the filter, as part of the water aspirated by the circulation pump also passes therethrough.
  • the dismountable coarse-mesh filter has therefore to be cleaned at relatively short intervals. Furthermore, this dishwashing machine is provided with stationary jet nozzles for automatically cleaning the fine-mesh and coarse-mesh filters.
  • jet nozzles are designed to produce jets of water substantially perpendicularto the axis of the coarse-mesh filter in proximity to the inlet side of the filter itself (where the tangential water jet has practically no effect at all) and in an intermediate zone, where the coarse-mesh filter is surrounded by the fine-mesh filter which disperses the water jet so as to render it ineffective with regard to the coarse-mesh filter.
  • dishwashing machines provided with rotating jet nozzles directed perpendicularly to the fine-mesh filter in countercurrent to the flow of the water aspirated by the circulation pump.
  • This construction does not provide a solution for the problem of automatically cleaning the discharge pump protection filter.
  • the rotating jet nozzles In view of their inclined positions, the rotating jet nozzles have no cleaning effect on the coarse-mesh filter, resulting in the latter being all the more readily clogged by the impurities.
  • a dishwashing machine in which a part of the recirculated water is passed through a collection chamber which is separate from the general flow of fluid and in which coarse particles entrained by the water are collected, as this chamber is closed by a fine-mesh filter and is situated in a bypass flow path of the recirculated water, so that most of the water fed to the spray nozzles for cleaning the dishes is not passed through said collection chamber and may be pumped with reduced pumping power.
  • the flow of water through said collection chamber is reversed and the residuals collected therein are emptied through a discharge conduit by means of a discharge pump.
  • the spray jet means preferably comprise at least one additional opening formed in at least one rotatable arm provided for irrigating the dishes.
  • Fig. 1 and 2 show diagrammatic representations of dishwashing machines in two functionally equivalent embodiments of the invention.
  • a dishwashing machine comprises a washing tub 3 (only partially shown), the bottom of which is formed as a well 4 for collecting the dishwashing and rinsing water. Disposed in communication with well 4 is a circulation pump 5 supplying at least one rotatable arm 6 for irrigating the dishes and the like to be washed (not shown) in a per se known manner.
  • Washing tub 3 contains a fine-mesh filter 7 disposed in the flowpath of the water collecting in well 4 after having been sprayed onto the dishes, and to be aspirated again by circulation pump 5.
  • Fine-mesh filter 7 is of a known configuration, having a frustoconical portion 7a for the insertion of a removable coarse-mesh filter 8 of corresponding shape disposed substantially in the flowpath of water from well 4 to a discharge pump 9.
  • Coarse-mesh filter 8 acts in a known manner as a discharge pump protection filter, protecting in particular the impeller of said pump.
  • the spray jet means are arranged to direct at least one water jet onto filter 8 in a substantially coaxial direction thereof for automatically cleaning the filter by disintegrating low-consistency impurities collected therein.
  • the water jet may be produced by providing an additional opening 10 at the bottom side of rotatable irrigation arm 6 (Fig. 1). In this case the water jet 11 is effective to clean filter 8 in an intermittent manner.
  • water jet 11 may be produced by a stationary jet nozzle 12 (Fig. 2) connected to the outlet of circulation pump 5, preferably on a horizontal axis and associated with a deflector 13 for directing the water jet towards the pump protection filter 8.
  • Deflector 13 may of course be mounted at any position considered most favourable. Also, water jet 11 may be produced in any equivalent manner.
  • the discharge pump protection filter 8 will always have been efficiently cleaned at the end of each operating cycle of the dishwashing machine.

Landscapes

  • Washing And Drying Of Tableware (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Detergent Compositions (AREA)
  • Fats And Perfumes (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

A dishwashing machine has a tub (3), a fine-mesh filter (7) disposed in the tub upstream of a circulation pump (5), and a coarse-mesh filter (8) seated within the fine-mesh filter upstream of a water discharge pump (9). The coarse-mesh filter is susceptible to clogging by coarse impurities of relatively soft consistency, necessitating frequent removal and cleaning of the filter. According to the invention, spray jet means is provided for directing a jet of water coaxially onto the coarsemesh filter for cleaning it by the disintegration of soft matter collected therein. The spray jet means may take the form of an additional opening (10) in the bottom side of a rotatable irrigation arm, or of a jet nozzle (12) fixedly mounted in a horizontal position and cooperating with a deflector (13) for directing the water jet (11) issueing from the jet nozzle onto the coarse-mesh filter.

Description

  • The present invention relates to a dishwashing machine provided with a discharge pump protection filter adapted to be automatically cleaned during operation of the machine, as set forth in the preamble of claim 1.
  • This dishwashing machine, known from IT-A-952 947 comprises a water collection well at the bottom of a washing tub, with the inlet of a water circulation pump and the inlet of a water discharge pump connected to said well.
  • The water collection well houses a fine-mesh recirculation filter disposed in the flowpath of the water aspirated by the circulation pump. The fine-mesh filter is formed with an opening directly connecting the interior of the tub with the inlet of the discharge pump. Disposed in this opening is a coarse mesh filter, referred to as a discharge pump protection filter and having as its main purpose the retention of coarse impurities, such as bits of china or glass, bones and the like which might otherwise obstruct or even damage the discharge pump.
  • The coarse-mesh pump protection filter will of course also retain shreds and bits of softer materials, such as paper shreds, breadcrumbs, fatty matter and the like, which may in the long run obstruct the filter, as part of the water aspirated by the circulation pump also passes therethrough.
  • The dismountable coarse-mesh filter has therefore to be cleaned at relatively short intervals. Furthermore, this dishwashing machine is provided with stationary jet nozzles for automatically cleaning the fine-mesh and coarse-mesh filters.
  • These jet nozzles are designed to produce jets of water substantially perpendicularto the axis of the coarse-mesh filter in proximity to the inlet side of the filter itself (where the tangential water jet has practically no effect at all) and in an intermediate zone, where the coarse-mesh filter is surrounded by the fine-mesh filter which disperses the water jet so as to render it ineffective with regard to the coarse-mesh filter.
  • Also known, for instance from US Patent 3,810,480 are dishwashing machines provided with rotating jet nozzles directed perpendicularly to the fine-mesh filter in countercurrent to the flow of the water aspirated by the circulation pump.
  • This construction does not provide a solution for the problem of automatically cleaning the discharge pump protection filter.
  • From European Patent Application No. 0068974 there is further known a dishwashing machine provided with rotating jet nozzles directed obliquely onto the surface of the fine-mesh recirculation filter so as to concentrate and to convey to the interior of the coarse-mesh discharge pump protection filter any particulate impurities collecting on the recirculation filter.
  • In view of their inclined positions, the rotating jet nozzles have no cleaning effect on the coarse-mesh filter, resulting in the latter being all the more readily clogged by the impurities.
  • From FR-A-2 445 130, a dishwashing machine is known, in which a part of the recirculated water is passed through a collection chamber which is separate from the general flow of fluid and in which coarse particles entrained by the water are collected, as this chamber is closed by a fine-mesh filter and is situated in a bypass flow path of the recirculated water, so that most of the water fed to the spray nozzles for cleaning the dishes is not passed through said collection chamber and may be pumped with reduced pumping power. After termination of the dishwashing cycle, the flow of water through said collection chamber is reversed and the residuals collected therein are emptied through a discharge conduit by means of a discharge pump. During the discharge phase, water is still being circulated through the rotating spray arms of the machine, one of said spray arms being provided with an opening at the bottom side thereof located at a position so as to intermittently direct a water jet onto the fine-mesh filter of said collection chamber. Thus, coarse impurities, such as bits of china or glass, bones or the like, collected in said chamber may damage the discharge pump.
  • It is the object of the present invention to provide a dishwashing machine of the aforementioned kind, which is provided with a discharge pump protection filter arranged to be automatically and efficiently cleaned at the end at least of each dishwashing cycle, preventing a discharge pump from being damaged by coarse impurities collected therein.
  • This object is attained by characterizing features of claim 1. Preferred embodiments of the invention are subject matter of the dependent claims.
  • The spray jet means preferably comprise at least one additional opening formed in at least one rotatable arm provided for irrigating the dishes.
  • In this manner, operation of the circulation pump automatically results in the disintegration of impurities collected in the discharge pump protection filter, which is usually disposed in a relatively quiescent zone of the washing tub. The coarse-mesh filter is thus always kept sufficiently clean, its maintenance being limited to the infrequent necessity of removing coarse and relatively indestructible impurities, such as bits of china or glass, bones and the like, from the filter.
  • The characteristics and advantages of the invention will become more clearly evident from the following description, given by way of example with reference to the accompanying drawings, wherein:
  • Fig. 1 and 2 show diagrammatic representations of dishwashing machines in two functionally equivalent embodiments of the invention.
  • With reference to the drawings, a dishwashing machine comprises a washing tub 3 (only partially shown), the bottom of which is formed as a well 4 for collecting the dishwashing and rinsing water. Disposed in communication with well 4 is a circulation pump 5 supplying at least one rotatable arm 6 for irrigating the dishes and the like to be washed (not shown) in a per se known manner. Washing tub 3 contains a fine-mesh filter 7 disposed in the flowpath of the water collecting in well 4 after having been sprayed onto the dishes, and to be aspirated again by circulation pump 5. Fine-mesh filter 7 is of a known configuration, having a frustoconical portion 7a for the insertion of a removable coarse-mesh filter 8 of corresponding shape disposed substantially in the flowpath of water from well 4 to a discharge pump 9.
  • Coarse-mesh filter 8 acts in a known manner as a discharge pump protection filter, protecting in particular the impeller of said pump.
  • According to the invention, in the dishwashing machine the spray jet means are arranged to direct at least one water jet onto filter 8 in a substantially coaxial direction thereof for automatically cleaning the filter by disintegrating low-consistency impurities collected therein.
  • In a preferred embodiment, the water jet may be produced by providing an additional opening 10 at the bottom side of rotatable irrigation arm 6 (Fig. 1). In this case the water jet 11 is effective to clean filter 8 in an intermittent manner.
  • In an alternative embodiment, water jet 11 may be produced by a stationary jet nozzle 12 (Fig. 2) connected to the outlet of circulation pump 5, preferably on a horizontal axis and associated with a deflector 13 for directing the water jet towards the pump protection filter 8.
  • Deflector 13 may of course be mounted at any position considered most favourable. Also, water jet 11 may be produced in any equivalent manner.
  • In any case, and in contrast to known arrangements, the discharge pump protection filter 8 will always have been efficiently cleaned at the end of each operating cycle of the dishwashing machine.

Claims (4)

1. A dishwashing machine comprising a washing tub (3) provided with a fine-mesh filter (7) disposed in the flowpath of water aspirated by a circulation pump (5) and formed with a frustoconical portion (7a) providing an opening (14) directly connecting the interior of said tub (3) with the water intake of a discharge pump (9) and a frustoconical coarse-mesh filter (8) seated in said frustconical portion (7a) of said fine-mesh filter (7), and further comprising spray jet means (10, 12,13) adapted to direct at least one water jet (11) against said coarse-mesh filter (8) from the input side thereof, characterized in that said spray jet means (10; 12, 13) is arranged to direct said at least one water jet (11) in a substantially coaxial direction with said coarse-mesh filter (8) during the washing phase of the machine operation for automatically cleaning said filter (8) by disintegrating low-consistency impurities collected therein.
2. A dishwashing machine according to claim 1, wherein said circulation pump (5) feeds at least one rotable spray arm (6) for spraying the dishes, characterized in that said spray jet means comprise at least one additional opening (10) formed in said rotatable arm (6).
3. A dishwashing machine according to claim 1, characterized in that said spray jet means comprise at least one stationary jet nozzle (12) connected to the outlet of said circulation pump (5).
4. A dishwashing machine according to claim 3, wherein the axis of said stationary jet nozzle (12) extents substantially transversely of the axis of said coarse-mesh filter (8), characterized by comprising a deflector (13) adapted to direct the water jet (11) exiting from said stationary jet nozzle (12) towards said coarse-mesh filter (8).
EP84116142A 1984-01-05 1984-12-21 Dishwashing machine with self-cleaning pump protection filter Expired - Lifetime EP0150478B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84116142T ATE54559T1 (en) 1984-01-05 1984-12-21 DISHWASHER WITH SELF-CLEANING PUMP PROTECTION FILTER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8434002U IT8434002V0 (en) 1984-01-05 1984-01-05 DISHWASHER MACHINES WITH SELF-CLEANING PUMP FILTER.
IT3400284U 1984-01-05

Publications (2)

Publication Number Publication Date
EP0150478A1 EP0150478A1 (en) 1985-08-07
EP0150478B1 true EP0150478B1 (en) 1990-07-18

Family

ID=11238505

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84116142A Expired - Lifetime EP0150478B1 (en) 1984-01-05 1984-12-21 Dishwashing machine with self-cleaning pump protection filter

Country Status (5)

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EP (1) EP0150478B1 (en)
AT (1) ATE54559T1 (en)
DE (1) DE3482759D1 (en)
ES (1) ES283281Y (en)
IT (1) IT8434002V0 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0222306A1 (en) * 1985-11-13 1987-05-20 INDUSTRIE ZANUSSI S.p.A. Dishwashing machine with self-cleaning recirculation filter
GB2191082A (en) * 1986-06-04 1987-12-09 Zanussi A Spa Industrie Dishwashing machine
EP0378980A2 (en) * 1989-01-11 1990-07-25 Aktiebolaget Electrolux Device for a dish-washer
EP0454640A1 (en) * 1990-04-26 1991-10-30 Aktiebolaget Electrolux Waste disintegrating device for a dishwater
AU768976B2 (en) * 2001-05-07 2004-01-15 Lg Electronics Inc. Passage structure of dishwasher
AU771909B2 (en) * 2000-12-14 2004-04-08 Lg Electronics Inc. Dishwasher

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1980193A1 (en) * 2006-05-30 2008-10-15 Electrolux Home Products Corporation N.V. Method for cleaning the filter of a dishwasher and dishwasher for carrying out the same
US10448801B2 (en) * 2016-03-17 2019-10-22 Samsung Electronics Co., Ltd. Self-cleaning filtration system for a dishwasher

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB286092A (en) * 1927-03-04 1928-03-01 Valdemar Rendle Improvements in and relating to washing machines for crockery and the like
US2236791A (en) * 1937-03-02 1941-04-01 Laval Separator Co De Dishwashing machine
DE1269776B (en) * 1960-01-16 1968-06-06 Boelkow Ludwig Filter device on dishwashers
AU527001B2 (en) * 1978-12-29 1983-02-10 Hobart International Inc. Warewasher bypass soil collector
US4392891A (en) * 1980-07-02 1983-07-12 Hobart Corporation Dishwasher soil collecting circuit
FR2508304B1 (en) * 1981-06-30 1986-02-07 Esswein Sa DISHWASHER WITH AUTOMATICALLY CLEANED RECYCLING FILTER

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0222306A1 (en) * 1985-11-13 1987-05-20 INDUSTRIE ZANUSSI S.p.A. Dishwashing machine with self-cleaning recirculation filter
GB2191082A (en) * 1986-06-04 1987-12-09 Zanussi A Spa Industrie Dishwashing machine
GB2191082B (en) * 1986-06-04 1989-12-06 Zanussi A Spa Industrie Dishwashing machine spray means for cleaning intake of discharge pump
EP0378980A2 (en) * 1989-01-11 1990-07-25 Aktiebolaget Electrolux Device for a dish-washer
EP0378980A3 (en) * 1989-01-11 1991-05-15 Aktiebolaget Electrolux Device for a dish-washer
EP0454640A1 (en) * 1990-04-26 1991-10-30 Aktiebolaget Electrolux Waste disintegrating device for a dishwater
AU771909B2 (en) * 2000-12-14 2004-04-08 Lg Electronics Inc. Dishwasher
AU768976B2 (en) * 2001-05-07 2004-01-15 Lg Electronics Inc. Passage structure of dishwasher

Also Published As

Publication number Publication date
ATE54559T1 (en) 1990-08-15
EP0150478A1 (en) 1985-08-07
ES283281Y (en) 1985-12-16
IT8434002V0 (en) 1984-01-05
ES283281U (en) 1985-05-01
DE3482759D1 (en) 1990-08-23

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